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= 225
L persegi panjang = 2 x 225
= 450
L persegi panjang = p x l
450 = p x 20
450 : 20 = p
22.50 = p
p x l = 2s^
p x 20 = 2x15^
20p = 450
p = 450/20 = 22,5 cm