Triangle Angle Sum Practice

Use the 180-degree angle sum of a triangle to find a missing interior angle.

Math7th Grade

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01 Find the missing angle in each triangle.

Use the triangle diagram and its measurements.

1. A triangle has angles 3° and 10°. Find the third angle.

2. A triangle has angles 10° and 6°. Find the third angle.

3. A triangle has angles 8° and 2°. Find the third angle.

4. A triangle has angles 6° and 7°. Find the third angle.

5. A triangle has angles 4° and 3°. Find the third angle.

6. A triangle has angles 2° and 8°. Find the third angle.

7. A triangle has angles 9° and 4°. Find the third angle.

8. A triangle has angles 7° and 9°. Find the third angle.