Question

Min knows that pi times radius equals 9.42 cm. What would she need to do to find the area?

Answer 1

`\bf \textit{area of a circle}\\\\ A=\pi r^2\\\\ -------------------------------\\\\ \textit{now, we know that }\pi r=9.42\impliedby \textit{let's square both sides} \\\\\\ (\pi r)^2=(9.42)^2\implies (\pi ^2r^2)=9.42^2\implies \pi \pi r^2=9.42^2 \\\\\\ \stackrel{area}{\pi r^2}~~=~~\cfrac{9.42^2}{\pi }`

Answer 2

Explanation:

Consider the provided information.

It is given that she knows
`\pi * r = 9.42`

Area of the circle is:
`A=\pi r^2`

Now consider the provided information.

`\pi * r = 9.42`

Step 1:

Squaring both sides.

`(\pi * r)^2 = (9.42)^2`

`\pi * \pi * r^2 = (9.42)^2`

Step 2:

Now divided both the sides by π.

`\pi r^2 = ((9.42)^2)/(\pi)`

`A=\pi r^2 = ((9.42)^2)/(\pi)`

Hence, by following the above steps she can find the area of circle.