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l = 16 cm
t = 10 cm
LP = (p × l) + 2(p × t) + 2(l × t)
= (20 × 16) + 2(20 × 10) + 2(16 × 10)
= 320 + 2(200) + 2(160)
= 320 + 400 + 320
= 1040 cm²
= (p x l) + 2(p x t) + 2(l x t)
(20 x 16) + 2(20 x 10) + 2(16 x 10)
320 + 400 + 320
1040cm²