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maka
180 = <A + <B + <C
180 = 7x + 6x + 5x
180 = 18x
180:18 = x
10 = x
<A = 7x = 7 (10) = 70
<B = 6x = 6(10) = 60
<C = 5x = 5(10) = 50
180 = 18x
x =
x = 10
sudut a = 7 x 10 = 70
b = 6 x 10 = 60
c = 5 x 10 = 50