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2x + (x + 5) + (7x + 15) = 180
2x + x + 5 + 7x + 15 = 180
10x + 20 = 180
10x = 180 - 20
10x = 160
x = 160 / 10
x = 16 derajat
besar sudut masng2 = 2x , (x+5) , (7x+15)
jumlah sudut segitiga = 180
mka :
2x + x+5 + 7x+15 = 180
10x + 20 = 180
10x = 180-20
10x = 160
x = 160/10
x = 16 derajat (B)