Question

determine o valor de x nos triângulos:
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Answer 1

A soma dos ângulos internos é igual a 180°

a)

3x - 15 + 2x + 3 + x + 12 = 180

3x + 2x + x = 180 + 15 - 3

6x = 192

x =192/6

x = 32

b)

3x + 40 - x + 5x + 35 = 180

3x - x + 5x = 180 - 40 - 35

7x = 105

x = 105/7

x = 7

c)

2x + 5x + 5x = 180

7x = 180

x = 180/7

x = 25, 71

d)

90 + x - 5 + x/2 + 5 = 180

180 + 2x + x = 360

2x + x = 360 - 180

3x = 180

x = 180/3

x = 60