Question

1. calculate the measure of ∠b. circle your answer.

Explanation:

Step1: Identify angle relationship

The diagram shows a right angle (90°) and a 23° angle, with ∠b forming a complementary angle with 23° (since they are in a right - angled context, sum to 90°).

Step2: Calculate ∠b

Using the formula for complementary angles: $\angle b=90^{\circ}- 23^{\circ}$
$\angle b = 67^{\circ}$

Answer:

$67^{\circ}$