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K = 2(p+l)
64=2(5/3 l + l)
32 = 8/3l
l=3*32/8
l = 12
p = 5/3 x 12
= 20
Luas = pxl
= 20 x 12
= 240cm²
moga dapat membantu dan srry kalo g jelas :D