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=16x9
=144cm²
Lpersegi==Lpersegipanjang
144=144
Lpersegi=s²
144=s²
s=√144
s=12cm
L Persegi = 16 cm × 9cm
=144 cm2
L Persegi = S × S
144 cm2 = (S kuadrat)
S = 12 cm
(diakar)