Discussion
Two angles of a triangle are 50° and 30°. Then, the third angle of the triangle is :
Answer: A
The third angle is 100°.
The angles of a triangle add up to 180°:
\[ 180^\circ - (50^\circ + 30^\circ) = 100^\circ \]
80° is the sum of the two given angles, not the third one, and 40° and 60° do not make the total 180°.
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