Question

As medidas dos angolos internos de um quadrilatero sao 8x+30 graus, 3x,7x+70 graus +2x+20graus, entao o valor de x mede

Answer 1

8x+30+3x+7x+70+2x+20=360
8x+3x+7x+2x=360-30-70-20
20x=240
x=240/20
x=12