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rumus luas balok : 2 x (pl + pt + lt)
diketahui : p = 20; l = 10; t = 15
Luas balok = 2 x (pl + pt + lt)
= 2 x ((20x10)+(20x15)+(10x15))
= 2 x (200+300+150)
= 2 x 650
= 1300 cm2
jadi, luas karton yg diperlukan adalah 1300 cm2
semoga membantu, jadikan jawaban terbaik ya!