Skills · Geometry · Triangles
Triangle angle sum and exterior angles
Printable practice with an answer key the engine computes, at three levels, in as many versions as you need.
Problem types
- the third angle: 47°, 65° and ?
- a right triangle’s other acute angle: a right angle, 35° and ?
- an exterior angle: remote angles 47° and 65°, exterior angle ?
- a remote interior angle, the exterior angle given: exterior (5x − 18)°, remote 47° and (2x + 10)°
- angles in a ratio, in words: The angles of a triangle are in the ratio 2 : 3 : 4. Find the largest angle.
Sample Sheet · Level 1
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Answer key
- 116°
- 42°
- 148°
- 64°
- 97°
- 49°
- 57°
- 29°
Sample Sheet · Level 3
Find m∠A.
Find m∠B.
Find m∠CBD.
Find m∠B.
Find m∠B.
Find m∠A.- The angles of a triangle are in the ratio 2 : 3 : 10. Find the smallest angle.
- The angles of a triangle are in the ratio 3 : 4 : 13. Find the smallest angle.
Answer key
- 45°
- 46°
- 141°
- 49°
- 42°
- 57°
- 24°
- 27°
Make your own
Pick the count, the level and the version, and print it with work space and the key on its own page. The same skill also makes an I Do, We Do, You Do lesson, a Mosaic, a Decoder and more.