Question

Complete the table below.

$\begin{array}{cccc}\text{S. No}& \text{Radius (r)}& \text{Diameter (d)}& \text{Circumference (C)}\\ \left(i\right)& 7cm& ---& ---\\ \left(ii\right)& ---& 28cm& ---\\ \left(iii\right)& ---& ---& 616cm\end{array}$

Answer 1

(i)

$r=7cm$

$\Rightarrow d=2r=2\times 7cm=14cm$

$C=2\pi r$

$=2\times \frac{22}{7}\times 7cm$

$\therefore C=44cm$

(ii)

$d=28cm$

$\Rightarrow r=\frac{d}{2}=\frac{28cm}{2}=14cm$

$C=2\pi r$

$=2\times \frac{22}{7}\times 14cm$

$\therefore C=88cm$

(iii)

$C=616cm$

$\Rightarrow 2\pi r=616cm$

$\Rightarrow 2\times \frac{22}{7}\times r=616cm$

$\Rightarrow r=\frac{7}{2\times 22}\times 616cm$

$\Rightarrow r=\frac{7}{2\times 2}\times 56cm$

$\Rightarrow r=7\times 14cm$

$\Rightarrow r=98cm$

$\Rightarrow d=2r=2\times 98cm=196cm$

$\begin{array}{cccc}\text{S. No}& \text{Radius (r)}& \text{Diameter (d)}& \text{Circumference (C)}\\ \left(i\right)& 7cm& 14cm& 44cm\\ \left(ii\right)& 14cm& 28cm& 88cm\\ \left(iii\right)& 98cm& 196cm& 616cm\end{array}$