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10x = 180
x = 18
sudut a = 54
penyiku sudut a = 90 - 54
= 36°
3 : 7
3y : 7y
<A + pelurus = 180
3y + 7y = 180
10y = 180
y = 18
maka
<A = 3y = 3 x 18 = 54
penyikunya = 90-54 = 36 derajat