Question

a triangle has interior angle measures of u, 40°, and 63°. what is the value of u?

Explanation:

Step1: Recall angle - sum property

The sum of interior angles of a triangle is 180°. So, $u + 40^{\circ}+63^{\circ}=180^{\circ}$.

Step2: Solve for u

$u=180^{\circ}-(40^{\circ} + 63^{\circ})$.
$u = 180^{\circ}-103^{\circ}$.
$u = 77^{\circ}$.

Answer:

$77$