Respuesta :

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 [tex]\pi r^{2}[/tex] where r denotes the radius of the circle and [tex]\pi[/tex] 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,

[tex]\pi r^{2}\\\\ =(3.14) (21^{2})\\\\=(3.14)(21)(21)\\\\=1384.74[/tex]

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

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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:

[tex]A={\pi}r^2[/tex]

where r is the radius of the circle.

[tex]A={\pi}(21)^2[/tex]

[tex]A=3.14(441)[/tex]

[tex]A=1384.74 cm^2[/tex]

[tex]A[/tex]≈[tex]1385cm^2[/tex]

Thus, the area of the circle is [tex]A[/tex]≈[tex]1385cm^2[/tex].

Hence, option B is correct.

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