Question

What is the approximate area of the circle shown below

Answer 1

(B)

Explanation:

Given: A circle with center C and the radius is 21cm.

To find: The area of the circle.

Solution: It is given that a circle with center C and the radius is 21cm.

The area of the circle is given as:

`A={\pi}r^2`

where r is the radius of the circle.

`A={\pi}(21)^2`

`A=3.14(441)`

`A=1384.74 cm^2`

`A`≈
`1385cm^2`

Thus, the area of the circle is
`A`≈
`1385cm^2`.

Hence, option B is correct.

Answer 2

Given: The figure of a circle with radius 21 cm².

To Find: Approximate area of the circle.

Solution: Answer is (B) 1385 cm².

Calculation/Explanation:

To find the area of a given circle, we must use the formula
`\pi r^(2)` where r denotes the radius of the circle and
`\pi` assumes the usual value of 3.14 approximately.

We substitute the radius r = 21 cm² of the given circle into the equation above and simplify. Thus,

`\pi r^(2)\\\\ =(3.14) (21^(2))\\\\=(3.14)(21)(21)\\\\=1384.74`

We round off to get approximately 1385 cm² which corresponds to answer B.