ABC-isosceles angle B = 25 degrees. Find the angle C degrees.

It is known:

Triangle ABC – isosceles triangle;

Angle B = 25 °;

Find corner C.

Decision:

1) In an isosceles triangle, angle A = angle B.

Hence, Angle A = 25 °.

2) The sum of the angles A, B and C is 180 °.

Angle A and angle B are equal and known. Hence, you can find the corner C.

Angle C = 180 ° – Angle A – Angle B = 180 ° – 25 ° – 25 ° = 180 ° – 2 * 25 ° = 180 ° – 50 ° = 130 °.

This means that the angle C of the triangle ABC is 130 °.