Geometry · Practice

Angles — Exercises

Graded practice problems from foundations to advanced. Enter your answer and press Check.

Foundations

Problem 1

Two angles are supplementary. One measures $65°$ . Find the other.

Problem 2

Two lines intersect, forming a $48°$ angle. What does the vertical angle measure?

Problem 3

What is the sum of the interior angles of a triangle in degrees?

Problem 4

Find the complement of a $40°$ angle.

Problem 5

Find the sum of interior angles of an octagon (8 sides).

Problem 6

Find each interior angle of a regular hexagon.

Problem 7

Parallel lines are cut by a transversal. Co-interior angles on the same side sum to how many degrees?

Problem 8

An exterior angle of a triangle measures $130°$ . What is the sum of the two non-adjacent interior angles?

Problem 9

A regular polygon has each interior angle equal to $150°$ . How many sides does it have?

Problem 10

Two parallel lines are cut by a transversal. Alternate interior angles measure $(x + 20)°$ and $(3x - 40)°$ . Find $x$ .

Problem 11

What is the sum of the exterior angles of any convex polygon, in degrees?