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K = 2p + 2l
52 = 2(12) + 2l
2l = 52 - 24
l = 28 / 2
l = 14
jadi lebar nya yaitu 14 cm
maka
L = p × l
L = 12 × 14
L = 168
jadi luasnya yaitu 168 cm²
semoga berguna +_+
52= 2.12x + 2.x
52= 24x+2x
52= 26x
52/26= x
2 = x.
jadi, luas = p.l
= 12(2) x 2
= 24 x 2
= 48