Answer:
x = 9
Step-by-step explanation:
Since the angle is bisected by rhe segment then the ratio of the sides to the corresponding parts of the base are equal, that is
[tex]\frac{15}{x}[/tex] = [tex]\frac{20}{12}[/tex] ( cross- multiply )
20x = 180 ( divide both sides by 20 )
x = 9
