Question

5. Find the radius of a circle whose circumference is 314 cm. (Take = 3.14)​

Answer 1

Circumference of a circle = 2πr

It is said to put the value of pi as 3.14

Circumference =314(Given)

Therefore,

314 = 2 πr

314 = 2 x 3.14 x r

314 = 6.28r

r = 314/6.28 = 50

therefore the radius is 50 cm

Answer 2

Given :

• Circumference of circle is 46.2 cm².

To Find :

• We have to find radius of the circle.

formula used :

${ \underline{\boxed{\pink{\bf{Circumference = 2 \pi r}}}}} \: \: \: \bigstar$

Solution :

We know that,

• circumference of circle = 2 π r

Now,

Putting Values :

$\\ \sf{ : \implies \: 314 = 2 \times 3.14 \times r}$

$\sf{: \implies \: 314= 2 \times 314 \times \frac{r}{10 \cancel0} }$

$\sf{: \implies \:31400 = 2\times 314 \times r }$

$\sf{: \implies \:100 = 2\times r }$

$\sf{: \implies \frac{100}{2}= r }$

$\sf{: \implies \:50 cm = r }$

$\sf{\red{: \implies \:r=50 cm }}$

therefore,

• the radius is 50 cm