Question

The vertical angle of an isosceles triangle is 100°. Find its base angles.​

Answer 1

Answer: One angle is 100° and other two angle be x.

x+x+100°=180°

2x=80°

x=40°

Hence other two angle is 40°

Answer 2

Answer:

It's base angle will be 40°+40°

Step-by-step explanation:

In isoceles triangle base angle's are congruent

consider A as an upper Vertical angle then consider B and C as base angles

A+B+C=180°(all angles of a triangle are supplementary)

100°+x°+x°=180°

100°+2x°=180°

2x°=180°-100°

=80°

x°=80°/2

x°=40°