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= sisi x sisi
= 2a x 2a
= 4a²
b. luas = luas persegi panjang
= panjang x lebar
= 3a x 3b
= 9ab
c. luas = luas persegi panjang
= panjang x lebar
= (2s + t) x 3s
= (2s x 3s) + (t x 3s)
= 6s² + 3st