The length of a rope, by which a calf is tied, is decreased from 9 m to 5 m. Find the decrease in the area that can be grazed by the calf. [Use π = $\frac{22}{7}$]
Answer & explanation
Correct answer: option 1
The length of a rope, by which a calf is tied, is decreased from 9 m to 5 m
The length of a rope, by which a calf is tied, is decreased from 9 m to 5 m. Find the decrease in the area that can be grazed by the calf.
We know that,
Area of the circle = π r2
= Old Area = π (9)2 = 81π
= New Area = π (5)2 = 25π
So, change in Area
= 81π - 25π
= 56π = (56 × \(\frac{22}{7}\)) = 176 m2