3 years ago

Which is the measure of angle D?

Mathematics

2 answers:

Yanka [14]3 years ago

6 0

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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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kompoz [17]3 years ago

6 0

The answer is the four position

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