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88cm= 2x7n + 2x4n
=14n+8n
=22n
n=88/22=4
p=7n=7x4=28
l=4n=4x4=16
Luas= 28x16=448cm
p = 7a
l = 4a
K = 2(p + l)
88 = 2(7a + 4a)
44 = 7a + 4a
44 = 11a
4 = a
p = 7a
= 7(4)
= 28 cm
l = 4a
= 4(4)
= 16 cm
L = p × l
= 28 cm × 16 cm
= 448 cm²
Jadi luas persegi panjang tersebut adalah 448 cm²