Question

Q.A circle has a radius of 21 cm. Then determine the area!EASY​

Answer 1

Answer:

A=1.386 cm²

Step-by-step explanation:

$\sf\bf A = \pi \times r \times r$

$\sf\bf = \frac{22}{7} \times 21 \times 21$

$\sf\bf = \frac{22}{\cancel{7}} \times \cancel{21} \times 21$

$\sf\bf = 22 \times 3 \times 21$

$\sf\bf = 66 \times 21$

$\sf\bf = 1.386 \: {cm}^{2}$

Answer 2

Hello there! :-)

The formula for finding the area of a circle is

• $A=\pi r^{2}$

Notice that only the radius is squared.

We are given the radius of the circle: 21 cm.

We plug the value of r into the formula:

• A=π(21)²
• A=π(441)
• A=1,385 cm

Hope this helps. Use the comment section to clarify your doubts.

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Good luck.