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p = 5 + l
K = 10 m = 100cm
Ditanya L........?
K = 2p + 2l
100 = 2 ( 5 + l ) + 2l
100 = 10 + 2l + 2l
100 - 10 = 4l
90 = 4l
l = 90/4
l = 22,5cm
p = 5 + 22,5
p = 27,5 cm
Luas = p x l
L = 27,5 x 22,5
L = 618,75 cm^2
L = 6,1875m^2