Question

One angle of an isosceles triangle measures 100°. Which other angles could be in that isosceles triangle?

Answer 1

Since the sum of the angles in a triangle = 180º, the 100º angle must be the vertex angle.

Since the base angles of an isosceles triangle = each other, each base angle = 40º.

Answer 2

Step-by-step explanation:

In an isosceles triangle two angles are equal

Let the equal angles be X

Given angle = 100°

Total sum of angles of a triangle = 180°

x+ x + 100° = 180°

2x + 100° = 180°

2x = 180° - 100°

x = 80°/2

x = 40°

so the other angles of the triangle are 40°