Question

angle r is a right angle. if a bisector were to be created in angle r, what would the measure of both congruent angles created be? 45° 90° 55° 70°

Explanation:

Step1: Recall right - angle measure

A right angle measures $90^{\circ}$.

Step2: Understand angle - bisector concept

An angle bisector divides an angle into two congruent (equal - measure) angles.

Step3: Calculate the measure of congruent angles

Let the measure of each congruent angle be $x$. Since the original angle is $90^{\circ}$ and it is divided into two equal parts, we have $2x = 90^{\circ}$, so $x=\frac{90^{\circ}}{2}=45^{\circ}$.

Answer:

A. $45^{\circ}$