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maka kedua sudut itu adalah 1/2 x 360 derajat = 180 derajat
180 = 7x + 3 x
180 = 10x
x = 180/10 = 18
maka sudut dg besar 7x = 7 x 18 = 126 drajat
dan yg dg 3x = 3 x 18 = 54 drajat
20x = 360
x = 18
Sudut ABC = 7x = 7(18) = 126 derajat
Sudut BCD = 3x = 3(18) = 54 derajat