Question

7. _______________ is the circumference of the circle, if the radius of the circle is 21 ​

Answer 1

Step-by-step explanation:

The diameter of circle is 21 ..

Radius = 21/2

As we know that ,

The formula to find circumference = 2πr

\begin{gathered}2 \times \frac{22}{7} \times \frac{21}{2} \\ \\ \frac{22}{7} \times 21 \\ \\ 22 \times 3 \\ \\ 66..cm\end{gathered}

2×

7

22

×

2

21

7

22

×21

22×3

66..cm

Answer 2

Step-by-step explanation:

2πr

r= 21

π=22/7

so,

2x22/7x 21

= 132

therefore it is 132