Question

find the measure of angle a. (equation required)
6)

Explanation:

Step1: Use triangle angle sum property

The sum of angles in a triangle is \(180^{\circ}\). So, \((63 + x)+(63 + x)+72 = 180\).

Step2: Simplify the equation

$$
LATEXBLOCK0
$$

Step3: Find angle \(A\)

Angle \(A=(63 + x)\). Substitute \(x = - 9\), so \(A=63+(-9)=54^{\circ}\).

Answer:

\(54^{\circ}\)