Question

(D) 243
u
.
U
Atin box of length 9 metres, breadth 2 metres and height 50 cm is made
without a lid. Find the total area of its faces.
(A) 29 m (B) 27 m2 (C) 23 m2 M 31 mi​

Answer 1

Length of box       L = 9 m

Breadth of box      B = 2 m

Height of box        H  = 50 Cm = 0.5 m

total area =  2 (LB + BH + LH) - L * B

               =  2 (9*2 + 2*0.5 + 9*0.5) - 9 * 2

               =  2 (18 + 1 + 4.5) - 18

               =  2 ( 23.5 ) - 18

               =  47 - 18

                = 29 

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