(Solved): (a) How many string units (radii) does it take to cover the circumference of the circle? (b) How ma ...

(a) How many string units (radii) does it take to cover the circumference of the circle? (b) How many string units (radii) does it take to cover the circumference of half the circle? Answer-1) Let, length of string be \( x \) Then, circle will be of radius \( x \) units and having circumference of \( 2 \pi x \) Let, \( x=1 \mathrm{~cm} \) Then, Diameter \( =2(1)=2 \mathrm{~cm} 2 \mathrm{~cm} \)