Question

What is the approximate area of the circle shown below

Answer 1

Answer:

(B)

Step-by-step 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.