Question

find the measure of the missing angle. 20° a

Explanation:

Step1: Identify the right angle

The diagram shows a right angle (90°) at the vertex with the square symbol.

Step2: Set up the angle sum equation

Let the missing angle be \( a \). The sum of the two angles (\( 20^\circ \) and \( a \)) should equal \( 90^\circ \) (since they form the right angle). So, \( 20^\circ + a = 90^\circ \).

Step3: Solve for \( a \)

Subtract \( 20^\circ \) from both sides: \( a = 90^\circ - 20^\circ = 70^\circ \).

Answer:

\( 70^\circ \)