Question

calcular medida x nas figuras

Answer 1

a)3x+x=180°
4x=180
x=180/4
x=45

b)x+20+4x-10=180
x+4x=180-20+10
5x=170
x=170/5
x=34

c)x-5+7x-15=180
x+7x=180+5+15
8x=200
x=200/8
x=25