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lebar. =2cm
jadi sisi=30cm
Luas persegi= Sisi x Sisi
= 30 x 30
= 900
Diket. lebar = 2 cm
maka p :
K = 2p + 2l
28 = 2p + 2(2) => 2 dikali 2
28 = 2p + 4
28 - 4 = 2p
24 = 2p
24/2 = p
12 = p
p ketemu 12 maka Luas persegi panjang :
L = p x l
= 12 x 2
L = 24 cm²