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P + l = 20,5
12,5 + L= 20,5
L =8
Luas = pxl
= 8x 12,5 = 100cm2
caranya :
K = 2p + 2l
41 = 2(12,5) + 2l
41 = 25 + 2l
2l = 41 -25
2l = 16
l = 16/2
l = 8
Luas = p.l
= 12,5 x 8
= 100
maaf ya kalo salah. semoga membantu