Question

Each face of a pyramid is an isosceles triangle with a 74° vertex angle. What are the measures of the base​ angles?

Answer 1

53 degrees at each angle

Answer 2

Os ângulos da base são congruentes...
A soma dos ângulos internos do triângulo é 180º
x + x + 74 = 180
2x = 180 - 74
2x = 106
x = 106/2
x = 53º (ângulos da base)