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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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Detailed Solution

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

Radius of the disc

= \frac{d}{2} ​

= \frac{0.5}{2} ​ = 0.25 cm

Area of the disc = πr2 =

\frac{22}{7}

(0.25)2 =

\frac{1.375}{7}

= 0.196 cm2

Thus, number of discs =

\frac{Area of Sheet}{Area of disc}

\frac{22}{0.196}

=112 discs

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