The sheet is 11cm long and 2cm wide. Circular pieces 0.5cm in diameter are cut from it to prepare discs. ____ is the number of discs that can be prepared.

# The sheet is 11cm long and 2cm wide. Circular pieces 0.5cm in diameter are cut from it to prepare discs. ____ is the number of discs that can be prepared.

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### Solution:

Area of sheet  =  length × breadth
= 11×2
=22  cm2

Area of the disc = πr2 = $\frac{{22}}{{7}}$​(0.25)2 = $\frac{{1}{.}{375}}{{7}}$ = 0.196 cm2

Thus, number of discs = $\frac{{\mathit{Area of Sheet}}}{{\mathit{Area of disc}}}$ = $\frac{{22}}{{0}{.}{196}}$ =112 discs

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