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Quizzes > Mathematics

Angle Test: Identify, Measure, and Compare Angles

Quick, free angles quiz to check your skills. Instant results.

Editorial: Review CompletedCreated By: Terra CastroUpdated Aug 28, 2025
Difficulty: Moderate
Grade: Grade 7
Study OutcomesCheat Sheet
Paper art illustrating a trivia quiz challenging high school students on angle problems.

This angle test helps you practice identifying, measuring, and comparing angles in 20 quick questions. After you finish, review angle pairs and parallel lines with the angle relationships quiz, build basics in the types of angles quiz, and strengthen circle skills with the inscribed angle quiz.

Which of the following angles is an acute angle?
180°
120°
90°
30°
An acute angle measures less than 90°. Among the given options, 30° is the only angle that meets this criterion.
What is the complementary angle of a 35° angle?
55°
45°
75°
65°
Complementary angles add up to 90°. Since 35° + 55° equals 90°, 55° is the correct complementary angle.
Find the supplementary angle of 110°.
60°
90°
80°
70°
Supplementary angles sum to 180°. Subtracting 110° from 180° yields 70°, making it the correct answer.
What is the measure of a right angle?
120°
90°
45°
60°
A right angle is defined as measuring exactly 90°. This is a fundamental definition in geometry.
When two lines intersect, which pair of angles are equal?
Adjacent angles
Complementary angles
Supplementary angles
Vertical angles
Vertical angles are formed when two lines intersect and are always equal in measure. This property distinguishes them from adjacent angles, which are not necessarily equal.
In a triangle, if two angles measure 50° and 60°, what is the measure of the third angle?
70°
90°
60°
80°
The sum of the interior angles of a triangle is always 180°. Subtracting 50° and 60° from 180° leaves 70° for the third angle.
If two adjacent angles form a linear pair and one angle is 130°, what is the measure of the other angle?
50°
40°
70°
60°
A linear pair of angles must add up to 180°. Hence, 180° - 130° equals 50° for the other angle.
What is the sum of the angles around a point?
90°
270°
180°
360°
The total measure of angles around a point is always 360°. This is a basic geometric fact regarding full rotation.
What is the sum of the interior angles of a quadrilateral?
360°
180°
90°
270°
A quadrilateral has four sides and the sum of its interior angles is calculated by (n-2)*180°. For n = 4, this equals 360°.
An exterior angle of a triangle is 120° and one of its remote interior angles is 40°. What is the measure of the other remote interior angle?
70°
60°
90°
80°
The exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles. Therefore, 120° - 40° gives 80° for the other angle.
When a transversal cuts two parallel lines, what is true about the alternate interior angles?
They are complementary
They are supplementary
They add up to 180°
They are equal
Alternate interior angles are always equal when the lines are parallel. This equality is a key property used to establish the parallelism of lines in geometry.
In the context of parallel lines and a transversal, corresponding angles are:
Unequal
Supplementary
Equal
Complementary
When a transversal intersects two parallel lines, each pair of corresponding angles is equal. This property is often used to prove parallelism or solve for unknown angles.
In an isosceles triangle with a vertex angle of 50°, what is the measure of each base angle?
65°
70°
60°
55°
The sum of the angles in any triangle is 180°. In an isosceles triangle, the two base angles are equal; subtracting the vertex angle of 50° from 180° and dividing the remainder equally gives 65° for each base angle.
What is the sum of the interior angles of a regular pentagon?
720°
500°
360°
540°
A pentagon has five sides, and the sum of its interior angles is given by (n - 2) Ã- 180°. For n = 5, the calculation is 3 Ã- 180° = 540°.
An angle is bisected into two equal parts. If the whole angle measures 80°, what is the measure of each bisected angle?
50°
60°
30°
40°
Bisecting an angle divides it into two congruent parts. Therefore, dividing 80° by 2 results in each angle measuring 40°.
In a parallelogram, if one angle measures 70°, what are the measures of the remaining angles?
110°, 110°, 110°, 70°
70°, 70°, 110°, 110°
70°, 70°, 70°, 130°
70°, 110°, 70°, 110°
A parallelogram has opposite angles that are equal and consecutive angles that are supplementary. Therefore, if one angle is 70°, the adjacent angle must be 110° (since 70° + 110° = 180°) and the pattern repeats.
Two angles are complementary and their measures are in the ratio 2:3. What are their measures?
40° and 50°
45° and 45°
36° and 54°
30° and 60°
Complementary angles sum to 90°. With a ratio of 2:3, let the angles be 2x and 3x. Solving 2x + 3x = 90° yields x = 18°, so the angles measure 36° and 54°.
An inscribed angle in a circle intercepts an arc measuring 100°. What is the measure of the inscribed angle?
50°
100°
75°
25°
An inscribed angle is always half the measure of its intercepted arc. Therefore, half of 100° is 50°, making this the correct answer.
In triangle ABC, angle A is twice angle B, and angle C is 30° more than angle B. What is the measure of angle B?
40°
45°
50°
37.5°
Let angle B be x. Then angle A is 2x and angle C is x + 30. Since the sum of angles in a triangle is 180°, setting up the equation 2x + x + (x + 30) = 180° yields 4x = 150°, so x = 37.5°. Thus, angle B is 37.5°.
A transversal intersects two parallel lines creating an angle of 3x and an alternate interior angle of 2x + 15. Find the value of x and the measure of these angles.
x = 15 and the angles measure 45°
x = 20 and the angles measure 60°
x = 5 and the angles measure 15°
x = 10 and the angles measure 30°
Alternate interior angles are equal when a transversal cuts parallel lines. Setting 3x equal to 2x + 15 gives x = 15; substituting back shows the angle measures 45°.
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Study Outcomes

  1. Analyze different types of angles, including acute, obtuse, right, and reflex angles.
  2. Apply angle relationships such as complementary, supplementary, and vertical angles to solve problems.
  3. Identify and use angle properties within various geometric shapes and figures.
  4. Synthesize geometric rules to determine unknown angle measures.
  5. Evaluate complex angle problems to prepare for further examinations.

Angles Quiz: Practice Test Cheat Sheet

  1. Understand the Types of Angles - Angles are the building blocks of every geometry problem! You'll learn to spot acute, right, obtuse, straight, reflex, and full angles in a snap. Master these basics to feel like an angle expert in no time.
  2. Master the Triangle Sum Theorem - In any triangle, the sum of the three interior angles is always 180°, no matter its shape or size. This simple but powerful rule helps you find unknown angles and crush geometry puzzles. Practice drawing triangles and checking your work to see this theorem in action!
  3. Learn About Complementary and Supplementary Angles - Complementary angles add up to 90°, while supplementary angles sum to 180°. These relationships pop up everywhere, from right triangles to straight lines. Once you spot these pairs, solving for missing angles becomes a breeze.
  4. Explore Parallel Lines and Transversals - When a transversal cuts across parallel lines, it creates matching corresponding angles and alternating interior angles. Identifying these patterns unlocks the proof that lines are parallel and reveals hidden angle measures. Use diagrams to mark equal angles and watch the magic unfold.
  5. Study the Exterior Angle Theorem - The exterior angle of a triangle equals the sum of its two opposite interior angles. This clever shortcut saves time when finding unknown angles outside a triangle. Try applying it on diverse triangle shapes for extra practice!
  6. Understand Vertical Angles - When two lines cross, they form vertical angles that are opposite each other and always equal. Spotting vertical angles helps you quickly solve for missing measures in intersecting lines. Draw big X's on diagrams to see these bundles and ace your angle problems.
  7. Learn the Inscribed Angle Theorem - An inscribed angle in a circle is half the measure of the central angle that spans the same arc. This rule is a game-changer for circle problems, so keep your compass handy when you study. Watching a quick video demo can help you visualize how the magic works!
  8. Familiarize Yourself with Angle Bisectors - An angle bisector cuts an angle into two equal parts and splits the opposite side of a triangle into proportional segments. This concept is vital for solving triangle side-length problems and finding in-centers. Grab your protractor and get bisecting!
  9. Practice Using the Pythagorean Theorem - In a right triangle, the square of the hypotenuse equals the sum of the squares of the other two sides: a² + b² = c². This mighty formula is your best friend when calculating side lengths and checking if triangles are right-angled. Challenge yourself with different number sets to build muscle memory!
  10. Apply Angle Measure Formulas - Whether you're tackling polygons, circles, or 3D shapes, knowing the right formula is half the battle. From interior angle sums to central angle measures, practice these formulas until they feel like second nature. A quick review before exams can turn confusion into confidence!
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