Isosceles Triangle Angle Calculation

In triangle ABC, the lengths of sides AB and AC are equal, making it an isosceles triangle. Moreover, angle B measures 40 degrees. What is the measure of angle C?

To solve for angle C, remember that the sum of all angles in a triangle is always 180 degrees.

Thus, if angle A is equal to angle C (since it's an isosceles triangle), we can express this relationship as:

Angle A + Angle B + Angle C = 180 degrees

Letting Angle A = Angle C, the equation transformed becomes:

2C + 40 = 180

Now, solve for C.