Question

how are ∠1 and ∠2 related? complete the equation. m∠1 + m∠2 = square^{circ}

Explanation:

Step1: Identify angle relationship

$\angle1$ and $\angle2$ form a right - angle.

Step2: Recall right - angle property

The measure of a right - angle is $90^{\circ}$. So $m\angle1 + m\angle2=90^{\circ}$.

Answer:

$90$