Which is the measure of angle D?

Question

asked Oct 19, 2021 166k views

2 Answers

Paul Scheltema · Answer 1 · 2021-10-25T23:14:13+0000

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Sum of the interior angles of any triangle is 180° .

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Thus ;

$In \: \: ∆ DEF→D + E + F = 180° \\$

D + 77° + 31° = 180°

D + 108° = 180°

Subtract sides 108°

$D + 108° - 108° = 180° - 108° \\$

D = 72°

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The correct answer is Option four .

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