Question

Find the measure
given exterior angles
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Answer 1

Answer:

Because the interior angles of a triangle add to 180°, and angles c+d also add to 180°:

The interior angles of a triangle add to 180°:a + b + c = 180°

Angles c and d make a straight angle, which is 180°:d + c = 180°

So d + c equals a + b + c:d + c = a + b + c.

Subtract c from both sides:d = a + b

Step-by-step explanation:

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