Question

Which is the measure of angle D?

Answer 1

The answer is the four position

Answer 2

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

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Thus ;

`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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