Question

A circular park of 28m diameter has been constructed.a3.5m circular track outside has been developed along the park. using algebraic formula find the area of the track around the park

Answer 1

use R=14m+3.5m
r=14m
area of track=pi {(R+r)^2-r^2}
=pi {(R+2r)(R)}
=22/7 {(21)(14)}
=924m^2

Answer 2

area of smaller track= 22/7(14×14-3•5×3•5)
22/7(196-12•25)
22/7×187•75cm^2