Question

The circumference of a circle is 1320cm. Find the radius and area of circle

Answer 1

Answer:

Step-by-step explanation:

Here I will be denoting circumference as 'C'

Area as 'A'

And radius as 'r'

According to the question

C=2πr

1320=2*(22/7)*r

(1320*7) / 44 = r. (By cross multiplication)

=> r = 210 cm

Now, A= πr²

A= 22/7(210)²

A=(22*210*210)/7

A = 138600 cm²

Answer 2

Answer:

Radius of circle is 210.19 cm.

Area of circle is 138724.69 ${cm}^{2}$

Step-by-step explanation:

Given -

Circumference of circle is 1320 cm

To find -

The area of circle and radius of circle

Solution -

As we know that,

Circumference of circle = $2 \times \pi \times r$

Where,

r is a radius of circle

Put the given values in these formula we get

$1320 = 2\pi \times r$

$\frac{1320}{2\pi} = r$

$\frac{660}{\pi} = r$

The value of π is 3.14 .

$\frac{660}{3.14} = r$

$r = 210.19$

So,

Radius is 210.19 cm.

Area of circle = $\pi {r}^{2}$

Where, r is radius of circle

Put the value of r we get

Area of circle = $\pi \times {210.19}^{2}$

Square means multiply the given values with itself twice.

Square of 210.19 is 44179.84

Area of circle = $\pi \times 44179.84$

The value of π is 3.14.

Area of circle = $3.14 \times 44179.84$

Area of circle = $138724.69$

Hence,

Area of circle is 138724.69 ${cm}^{2}$