hitung luas permukaan balok jika A. V= 24 cm3, P=4 cm, L=3 cm B. V= 315 cm3, P= 9 cm, L= 7 cm

a.t=24/(4×3)=24/12=2 cm
luas
=2×(pt)×(pl)×(lt)
=2×8×12×6
=1.152 cm^2

b.t=315/(9×7)=315/63=5 cm
luas
=2×(pt)×(pl)×(lt)
=2×45×63×35
=198.450cm^2

semoga membantu sob!

A) V = p x l x t
  24  = 4 x 3 x t
  24  = 12 x t
     t  = 24/12
     t  = 2 cm
 
Luas permukaan
= 2 x (pl + pt + lt)
= 2 x (4.3 + 4.2 + 3.2)
= 2 x (12 + 8 + 6)
= 2 x 26 cm²
= 52 cm²

B) V = p x l x t
 315 = 9 x 7 x t
 315 = 63 x t
   t    = 315/63
   t    = 5 cm

Luas permukaan
= 2 x (pl + pt + lt)
= 2 x (9.7 + 9.5 + 7.5)
= 2 x (63 + 45 + 35)
= 2 x 143 cm²
= 286 cm²