Grade 10 math · A.2 · Triangles
Angles in a triangle
The three angles add up to 180°.
See worked examples
Two angles of a triangle are 34° and 91°. What is the third angle?
Answer: 55°
Two angles of a triangle are 32° and 33°. What is the third angle?
Answer: 115°
Two angles of a triangle are 97° and 49°. What is the third angle?
Answer: 34°
Tip: The three angles add up to 180°.
Curriculum
Common Core: HSG-SRT.C.8, HSG-CO.C.10
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