Question

What is the measure of the vertex angle of an isosceles triangle if one of its base angles measures 42°?

Answer 1

96 degrees

Explanation:

you have two angles that each measure 42 degrees, giving you 84 degrees combined

there are 180 degrees in a triangle, therefore the vertex angle is equal to 180 minus 84, or 96 degrees

check:

42 + 42 + 96 = 180

180 = 180