Geometry (Angles & Triangles) Vocabulary
Adjacent Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Perpendicular Lines
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Exterior Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Congruent Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Parallel Lines
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Alternate Interior Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Transversal
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Alternate Exterior Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Vertical Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Supplementary Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Corresponding Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Supplementary Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
Interior Angles
Lines that intersect at right angles
Two angles that share a common side and have the same vertex
A line that intersects two or more lines
Angles that have equal measure
Sum of two angles is 90
When two parallel lines are cut by a transversal, these four angles are formed on the inside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the exterior of the parallel
Two angles that are opposite angles formed by the intersection of two lines
Angles that lie on the same side of the transversal and either both are above or both below the parallel lines
Sum of two angles is 180
When two parallel lines are cut by a transversal, these four angles are formed on the outside of the parallel lines
When a transversal intersects parallel lines these angles lie on opposite sides of the transversal and the interior of the parallel lines
Lines in the same plane that do not intersect
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