Question

The radius of a circle is 3.9 in. Find the circumference to the nearest tenth.

Answer 1

Answer:

C = 24.5 in

Step-by-step explanation:

Formula to find the circumference of a circle is :

C = 2πr

Here,

r ⇒ radius

So let us solve now.

C = 2πr

C = 2 × π × r

C = 2 × 3.14 × 3.9

C = 24.492 in

So, they've asked for nearest 10th.

Therefore, the answer will be 24.5 in.

Hope this helps you :-)

Let me know if you have any other questions :-)

Answer 2

Answer:

$\huge{ \boxed{\boxed{\tt Circumference≈24.5 \: in.}}}$

Step-by-step explanation:

Given:-

Radius of the circle = 3.9 in.

To Find:-

The Circumference

Solution:-

We know that the formula of Circumference is :

$\boxed{ \sf \: Circumference = 2\pi{r}}$

Note that r equals to radius which is given.

Now,Put the value of radius (r) :-

$\sf \implies \: Circumference = (2\pi \times 3.9) \; in.\:$

We know that the value of π is :-

$\boxed{\sf \: \pi = 3.14}$

So put the value of π :-

$\sf \implies{Circumference} =( 2 \times 3.14 \times 3.9 )in.$

Simplify this:

Multiply 2 and 3.14 :-

$\sf \implies{Circumference} = (6.28 \times 3.9) \: in.$

Multiply 6.28 and 3.9 :-

$\sf \implies{Circumference} = 24.492\; in.$

Hence,the circumference of the circle would be 24.492 in. .

But We are asked to find the circumference to the nearest Tenth.

So,the Nearest Tenth of 24.492 in. is :-

$\sf \implies{Circumference} ≈ 24.5 \: in.$

Hence, the circumference to the nearest Tenth of the circle would be;

$\boxed{\sf {Circumference} ≈ 24.5\; in.}$

We're done!

$\rule{225pt}{2pt}$

I hope this helps!

Let me know if you have any questions.

:)