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= 8
panjang = 5/8 x 40
= 25
lebar = 3/8 x 40
= 15
40 = 2(5x+3x)
40 = 2(8x)
40 = 16x
x = 40/16
x = 5/2
p = 5.5/2
= 25/2
= 12,5 cm
l = 3.5/2
= 15/2
= 7,5 cm