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