misal sisi² segitiga dianggap 3x, 4x, 5x
maka keliling ∆= 3x+4x+5x=72
12x= 72
x= 6
maka panjang c =5x6=30cm. (A)
a = 3x, b = 4x, c = 5x
K = a+b+c
72 = 3x+4x+5x
72 = 12x
x = 6
c = 5x = 5.6 = 30 cm
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misal sisi² segitiga dianggap 3x, 4x, 5x
maka keliling ∆= 3x+4x+5x=72
12x= 72
x= 6
maka panjang c =5x6=30cm. (A)
a = 3x, b = 4x, c = 5x
K = a+b+c
72 = 3x+4x+5x
72 = 12x
x = 6
c = 5x = 5.6 = 30 cm