Question

A rope by which a cow is tethered is increased from $23$ m. how much additional ground does it have now to graze?

Answer 1

The area in which cow can graze when rope is 16 m long$=\pi r^2$

$=(3.14\times {16}^2)m^2=803.84m^2$

The area in which cow can graze when rope is $23m$ long$=\pi r^2$

$=(3.14\times {23}^2)m^2=1661.06m^2$

Increase in area $=(1661.06-803.84)m^2=857.22m^2$ which is additional ground to graze.