Missing Angles Worksheet Generator (Triangles, Straight Lines, Quadrilaterals & More)

Print free find-the-missing-angle pages for grades 4–6. Choose a right angle split in two (complementary), angles on a straight line (supplementary), angles in a triangle or a quadrilateral, angles around a point, vertical angles, or a mixed review. Every diagram is drawn to its true angles, in multiples of 5° or any whole degree, with the unknown marked x or ? and an exact answer key.

ActivityNumbersMissing angle is markedProblems per pageInclude an answer key on a second page

Every picture is drawn to its true angles, so children can check an answer by eye. Start with right angles and straight lines in multiples of 5°, move on to triangles and quadrilaterals, then use the mixed review with any whole degree. A small square always marks a right angle.

Go to print queue →8 problems

Missing Angles: Triangles

The three angles in a triangle add up to 180°. Find the missing angle.

1x=°

2x=°

3x=°

4x=°

5x=°

6x=°

7x=°

8x=°

Answer KeyMissing Angles: Triangles

1x=85°

2x=40°

3x=60°

4x=30°

5x=85°

6x=70°

7x=40°

8x=50°