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2014-06-10T16:25:45+07:00
No. 31)  keliling = 2(p+l)
64 = 2(5x+3x)
64 = 2(8x)
64 = 16x
x = 64 : 16
x = 4

panjang = 5(4)
= 20
lebar = 3(4)
= 12

luas = pxl
=20 x 12
= 240 cm2 (a)
1 5 1