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c1 : c3 = 2:8
c1 = 2x = 24
x = 12
c3 =8x = 96
c3 = 96
9) Jumlah total sudut2 segitiga pasti 180
180 = 70 + 2x + 3x
180-70 = 5x
110 =5x
x = 22
A = 2x
A = 2. 22
A= 44