Question

what is the missing angle?

Explanation:

Step1: Recall angle - sum property

The sum of interior angles of a triangle is 180°.

Step2: Set up the equation

Let the missing angle be $x$. Then $x + 48^{\circ}+87^{\circ}=180^{\circ}$.

Step3: Solve for $x$

$x=180^{\circ}-(48^{\circ} + 87^{\circ})=180^{\circ}-135^{\circ}=45^{\circ}$.

Answer:

45