Question

The spoken of a wheel is 21cm.Find its circumference

Answer 1

Answer:

Given,

Radius (r) = 21cm

Circumference of Circle (C)= ?

Now,

We know,

C=2πr

=2×22/7 × 21

= 132cm.

Answer 2

Answer:

The circumference is 131.88cm

Step-by-step explanation:

Here we have been given that the spoke of the wheel which is equivalent to the radius of the circular wheel is 21cm. We have been asked here to find the total circumference of the wheel. Now we know that for any circle or equivalent shape the circumference is found by:

Circumference = $2\pi r$

Radius = 21 cm

∴ Circumference = 2 × $\pi$ × 21

= 2 × 3.14 × 21 cm

= 131.88 cm

Therefore the circumference of the wheel is 131.88 cm