Printable practice with an answer key the engine computes, at three levels, in as many versions as you need.
Problem types
a base angle, the vertex angle given: vertex angle 40°, a base angle ?
the vertex angle, a base angle given: a base angle 35°, the vertex angle ?
the equal sides (the legs): legs 9 and ?, base 5
an equilateral triangle: sides (4x − 3) and (2x + 9), all three marked equal
Sample Sheet · Level 1
Find the measure of the angle marked ?.
Find the length marked ?.
Find the length marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Find the length marked ?.
Find the measure of the angle marked ?.
Find the measure of the angle marked ?.
Answer key
63°
18 units
10 units
26°
100°
13 units
51°
120°
Sample Sheet · Level 3
Find m∠A.
Find m∠A.
Find AB.
Find m∠C.
Find BC.
Find AC.
Find m∠B.
Find AC.
Answer key
92°
56°
25 units
69°
39 units
26 units
70°
6 units
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.