Respostas

2013-12-07T12:16:28-02:00
2x+10+x-20+2x+30=180
5x=180-10+20-30
5x=170+20-30
5x=190
5x=160
x=160/5
x=32

Calculamos:

2x+10
2.32+10
64+10
74

x-20
32-20
12

2x+30
2.32+30
64+30
94

Assim o maior ângulo desse triângulo mede 94 graus.