Question
There are 4 semi-circular gardens on each side of a square-shaped pond with each side 21 m. The cost of fencing the entire plot at the rate of Rs. 12.50 per metre is :
Answer: Option B
Length of the fence =$$4\pi R$$
Where, $$R = \frac{{21}}{2}m$$
$$\eqalign{
& 4\pi R \cr
& = \left( {4 \times \frac{{22}}{7} \times \frac{{21}}{2}} \right)m \cr
& = 132\,m \cr} $$
Cost of fencing :
$$\eqalign{
& = {\text{Rs}}{\text{.}}\left( {132 \times \frac{{25}}{2}} \right) \cr
& = {\text{Rs}}{\text{.1650}} \cr} $$
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Length of the fence =$$4\pi R$$
Where, $$R = \frac{{21}}{2}m$$
$$\eqalign{
& 4\pi R \cr
& = \left( {4 \times \frac{{22}}{7} \times \frac{{21}}{2}} \right)m \cr
& = 132\,m \cr} $$
Cost of fencing :
$$\eqalign{
& = {\text{Rs}}{\text{.}}\left( {132 \times \frac{{25}}{2}} \right) \cr
& = {\text{Rs}}{\text{.1650}} \cr} $$
Was this answer helpful ?
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