Question

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

40° , 25° , 35° , 85°

Answer 1

40 degrees

Explanation:

The sum of the angles is 180.

A 100 degree angle cannot be a base angle because then

the sum of the base angles would be 200 degrees.

The 100 must be the vertex angle.

Equation:

x + x + 100 = 180

2x = 80

x = 40 degrees.

Each of the base angles is 40 degrees.