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p = 3l
K = 2 ( p + l )
56 = 2 ( 3l + l)
28 = 4l
l = 7 cm
p = 3l = 3 . 7 = 21 cm
L = p × l = 21 × 7 = 147 cm²
keliling persegi panjang = 2panjang+2lebar = 56
= 2 x 3 + 2 x 1= 56
= 6 + 1 = 56
= 7 = 56
= 56: 7 = 8
panjang = 3 x 8 = 24
lebar = 1x8 = 8
luas = 8 x 24 = 192