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panjang = 24 cm
lebar = 16 cm
maka :
K persegi panjang = 2 x (p+l)
= 2 x (24+16)
= 80 cm
K persegi = 1/2 K persegi pnjang
= 1/2 (80)
= 40 cm
jadi :
K = 4 x sisi
40 = 4 sisi
sisi = 40/4
sisi = 10 cm
jadi panjang sisi persegi adalah 10 cm