Question

Pergunta ta na foto:​

Answer 1

Resposta:

180 é a soma dos ângulos internos

A)

2x+5+2x-20+3x+10=180

7x+15-20=180

7x-5=180

7x=180+5

x=185/7

x=26.428...

B)

2x+5+2x-20+3x+13=180

7x+18-20=180

7x-2=180

7x=180+2

x=182/7

x=26

C)

6x+3x+3x=180

12x=180

x=180/12

x=15

D)

2x-5+3x-8+2x-20=180

7x-33=180

7x=180+33

x=213/7

x=30.428...