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78 = 2(8x + 5x)
78=2(13x)
39=13x
x=3
p=8x=24
l=5x=15
maka luas = p x l = 24 x 15 = 360 m^2
panjang = 48/2 = 24
2l = 5/13 x 78 = 5 x 6 = 30
lebar = 30 / 2 = 15
mk ; luas = p x l
= 24 x 15 = 360 m²