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56= 2(3a+a)
56= 8a
7 =a
p=3a
3.7=21
l=a
7cm
jadi luas= p.l
21.7
147
56 = 2(3L) + 2L
56 = 6L + 2L
56 = 8L
7 = Lebar
L = 1/3 P
3L = P
3×7 = P
21 =P
lebar = p . l
=21 . 7
= 147 cm kuadrat