The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?
Accepted Solution
A:
A triangle has three angles, and their measures add up to 180 degrees. An isosceles triangle has at least 2 congruent sides, and the angles opposite the congruent sides are congruent.
This triangle has one angle of 40 deg, and two angles that measure the same; call the measure of each base angle x.