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manoj meena

· started a discussion

· 1 Months ago

Problem (Question:110685.0)

Sir why not pie square

Question:
A cistern from inside is 12.5 m long, 8.5 m broad and  4 m high and is open at top. Find the cost of cementing the inside of a cistern at Rs.24 per sq. m
Options:
A) Rs.6582
B) Rs.8256
C) Rs.7752
D) Rs.8752
E) None of these
Solution:

Area of surface to be cemented = 2 x (l+b) x h + (lxb)

i.e, area of four walls + area of floor 

= 2 x (21) x 4 + (106.25) 

= 274.25 m2 

∴ cost of cementing = 24 x 274.25 = Rs.6582


Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Its cuboid.....pi doesn't appear in the formula of area of cuboid.
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