Question

An exterior angle of a triangle equals _______ minus the adjacent interior angle. 90 270 180 360An exterior angle of a triangle equals _______ minus the adjacent interior angle. 90 270 180 360

Answer 1

180

The exterior angle of a triangle + the adjacent interior angle are supplementary, that is sum to 180°, thus

the exterior angle = 180 - adjacent interior angle

Answer 2

180º

Explanation:

You know that the sum of the inside angles of a triangle is 180º because they are supplementary.

But the other characteristic of a triangle is that the exterior angles summed the interior are also supplementary so, it's 180º.

An exterior angle of a triangle equals 180º minus the adjacent interior angle.