Question

tin box of length 9 metres, breadth 2 metres and height 50 cm is made without a lid.Find the total area of its faces.

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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Answer 2

Total area of its faces = lateral surface area + Area of bottom = 2(l+b)h + l×b
= 2(9+2)0.5 + 9×2 = 2× 18 × 0.5 + 18 = 36m^2