Question

determine o valor de X em cada item as marcas iguais indicam ângulos congruentes

Answer 1

a) 25 + x + 10 + 25 = 90 ---> x = 90 - 60 ---> x = 30

b) x - 15 + x + 25 = 90 ---> 2x = 90 + 10 ---> x = 100/2 = 50

c) 2x + 3x + x = 180 ---> 6x = 180 ---> x = 180/6 = 30