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p = 3l
K = 64 cm
Dijawab :
K = 2(p +l)
64 = 2(3l +l)
64 = 8l
l = 64/8
l = 8 cm
Maka,
p = 3l
= 3(8)
= 24 cm
Sehingga,
L = p . l
= 24 . 8
= 192 cm²
Itu jawabannya.
64 cm = 2 x 3l + 2 l
64 cm = 6l + 2l
64 cm = 8l
l = 8 cm
sehingga,
Luas = p x l
= (8 x 3) x 8
= 24 x 8
= 192 cm2