Mathematics: Stefan is measuring the angles of a triangle. he measures the first angle and gets a measure of 90°. what does he know about the other two angles? a) they are each 45°. b) they should add up to be 270° c) their measures should add up to be 90° d) he doesn t know anything about the other two angles.

Stefan is measuring the angles of a triangle. he

foralways4871

12.03.2022

I 100% positive the answer is C)Their measures should add up to be 90° i just took the test and the answer above me is 100% wrong

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zay12350

28.09.2021

Step-by-step explanation:

∠ 5 and ∠ 8 are adjacent angles and are supplementary, sum to 180° , then

∠ 8 + ∠ 5 = 180°

∠ 8 + 45° = 180° ( subtract 45° from both sides )

∠ 8 = 135° → C

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