Question

4 find the measure of angle b.

b = ____ degrees

Explanation:

Step1: Identify right angle sum

The three angles form a 90° angle, so:
$b + 30^\circ + 90^\circ = 180^\circ$

Step2: Isolate angle b

Subtract known angles from 180°:
$b = 180^\circ - 90^\circ - 30^\circ$

Step3: Calculate angle b

Compute the remaining value:
$b = 60^\circ$

Answer:

$60$ degrees