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L.persegi + L.jajar genjang
p×l + a×t
(20 × 12) + (20×12)
240 + 240
480cm2
= ( p × L ) + ( a × t )
= ( 12 ×20 ) + ( 20 × 12 )
= 240 + 240
= 480cm2
maaf kalau salah