Question

Find the circumference of each circle.Take π=22÷7and diameter=9.8m

Answer 1

D=9.8m
then r=4.9m

Circumference of Circle = 2πr
then, 2×22/7×4.9
= 2×22/7×49/10
= 3080m

Answer 2

$\large\mathsf{Hoy !!}$


$\mathsf{\underline{Given}}$ :


$\mathsf{Diameter \ = \ 9.8 \ m}$

$\mathsf{{\pi} \ = \ {\dfrac{22}{7}}}$


$\mathsf{\underline{Solution}}$ :


$\mathsf{Radius \ = \ {\dfrac{Diameter}{2}}}$

$\mathsf{Radius \ = \ {\dfrac{9.8}{2}}}$

$\mathsf{Radius \ = \ 4.9 \ m}$


${\large{\boxed{\mathsf{\blue{Circumference \ of \ circle = \ 2{\pi}r}}}}}$


$\mathsf{Here, \ r \ = \ radius}$

$\mathsf{Putting \ values}$

$\mathsf{Circumference \ = \ 2 \ ( \ {\dfrac{22}{7}} \ ) \ ( \ 4.9 \ )}$

$\mathsf{= \ 2 × 22 × 0.7}$

$\mathsf{= \ 30.8 \ m}$


$\mathsf{Hence,}$

$\large\mathsf\red{\underline{Circumference \ = \ 30.8 \ m}}$

$<b><i>$

^^"