Stefan is measuring the angles of a triangle. He measures the first angle and gets a measure of 80° What does he know for sure about the other two angles?A) They are each 50°.
B) Their measures add up to 100°.
C) Their measures add up to 120°.
D) Their measures add up to 180°.
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Answer:
D
Step-by-step explanation:
Every triangles angles add up to 180.
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