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= (2 x 1/2 x 5 x 12) + ((5 + 12 + 13) x 20)
= 60 + 600
= 660 cm²
semoga membantu ya :)
=(12+5+13) x 20 + 2 x 12 x 5 / 2
=30 x 20 + 60
=600 + 60
= 660