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50 = 4. s
50/4 = s
s =12,5
panjang taman 12,5
dengan :
p = X+5
l = X
50 = 2(p+l)
50 = 2[(X+5) + X]
50 = 2X + 10 + 2X
50 = 4X + 10
4X = 50 - 10
4X = 40
X = 10, jadi panjang = X+5 = 10 + 5 = 15m