Answer:
To find the measure of angle A, we substitute the given expression into the formula for the measure of an angle:
A = 12x + 12 degrees
To find the measure of angle C, we substitute the given expression into the formula for the measure of an angle:
C = 3x + 18 degrees
The measure of angle B is already given as 15 degrees.
Therefore, the measures of the three angles are:
Angle A = 12x + 12 degrees
Angle B = 15 degrees
Angle C = 3x + 18 degrees