Question

In ΔJKL, m∠J = 78° and m∠L = 90°. Determine the measure of the exterior angle to ∠K.

168°
102°
57°
12°

Answer 1

78 + 90 = 168 the exterior angle to

Answer 2

168°

Explanation:

The sum of two interior angles in a triangle is equal to an exterior angle that is supplementary to the third interior angle, which is k, in this case.

m∠J = 78 and m∠L = 90° so the measure of exterior angle to ∠K:

78 + 90 = 168°