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jika K = 56, maka
2 (p+l) = 56
p + l = 28
p + 1/3p = 28
4/3 p = 28
p = 28. 3/4
= 21 cm
l = 1/3 p
= 1/3. 21
= 7 cm
L = p x l
= 21 x 7
= 147 cm²
2{3/3p+1/3p} = 56cm
4/3p = 56cm/2
p = 28 x 3
4
p = 21cm
panjang = p = 21cm
lebar = 1/3p
= 7cm
luas = 21x7
= 147cm²