# In an isosceles triangle, the apex angle is 100 degrees. calculate the degree measure

**In an isosceles triangle, the apex angle is 100 degrees. calculate the degree measure of the remaining equal angles.**

Let’s find the sum of two angles at the base in the isosceles triangle given to us, for this we need to subtract the measure of the angle at the apex of this triangle from 180 °:

180 ° – 100 ° = 80 ° is the sum of two angles at the base of this triangle;

Let’s find the measure of the angle at the base of this isosceles triangle, for this we need to divide the sum of two angles at the base of this triangle by two, since the angles at the base of an isosceles triangle are equal:

80 °: 2 = 40 ° is the measure of each angle at the base of a given isosceles triangle.

Answer: 40 ° is the measure of each angle at the base of a given isosceles triangle.