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kell = 2(p+l)
70 = 2(3x+2x)
35 = 5x
x = 7
P : L = 3(7):2(7)
= 21 : 14
luas = p xl
= 21 x 14
= 294 cm^2
K = 2p + 2l
70 = 2.3n + 2.2n
70 = 6n + 4n
70 = 10n
n = 7
maka: p= 3n = 3.7 = 21 cm
l = 2n = 2.7 = 14 cm
jadi, L = p.l
= 21.14 = 294 cm²