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64 = (2.8+l) + (2.l)
64 = (16 + 2l) + 2l
64 = 16 + 4l
64-16 = 4l
48 = 4l
12cm = l
L = p.l
= 12.8 cm²
= 96
K = 64 cm
p = 8 + l
Maka,
K = 2(p + l)
64 = 2(p + l)
32 = p + l
Masukkan p,
32 = p + l
32 = (8 + l) + l
32 = 8 + 2l
2l = 32 - 8
2l = 24
l = 24/2
l = 12 cm
Masukkan l,
p + l = 32
p + 12 = 32
p = 32 - 12
p = 20 cm
Luas = p x l
Luas = 20 x 12
Luas = 240 cm²
Jadi Luasnya adalah 240 cm²