Question

A sheet is 11 cm in length and 2 cm in width. Circular pieces of 0.5 cm in diameter is cut from it to prepare discs.Calculate the number of discs that can be prepared.

Answer 1

Here is the Ans
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Total number of discs can be prepared = Area of the sheet/Area of one circular disc
now

Area of the sheet = l×b

Area of one circular disc = πr² 

Area of the sheet = 11×2 = 22 sq cm

Area of one circular disc = 22/7×0.25×0.25
== >
(22)/(22/7×0.0625)
==>
(22×7)/22×.0625

=>
7/0.0625

=>
70000/625
112 discs Ans