Question

find the measure of the missing angle.
answer attempt 1 out of 3
a =
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Explanation:

Step1: Identify the triangle type

The triangle is a right triangle, so one angle is $90^\circ$.

Step2: Use angle sum property

In a right triangle, the sum of the two non - right angles is $90^\circ$. We know one angle is $69^\circ$, so to find $a$, we use the formula $a = 90^\circ- 69^\circ$.
$a=90 - 69=21$

Answer:

$21$