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8x+5x=39
13x=39 x=3
luasnya adalah
24×15=360 m²
K = 78
2(p+l) = 78
p+l = 39
p = (8)/(8+5) x (39) = 8 x 3 = 24 cm
l = 39 - 24 = 15 cm
jadi,
L = p x l = 24 x 15 = 360 cm^2