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Lp = 2(28.12) + 2(28.8) + 2(12.8) = 672+448+192=1312
V=28.12.8=2688
l = 3/ 7 . 28 ⇒ 12 cm
t = 2/7 . 28 ⇒ 8 cm
a) Lp = 2 (pl + pt + lt)
Lp = 2 (28 . 12 + 28 . 8 + 12 . 8)
Lp = 2 (336 + 224 +96 )
Lp = 656 cm²
b) V= p . l .t
V = 28 . 12 . 8
V = 2688 cm³