Question

I always get these wrong

Answer 1

Hi there! Answer: r = 9 feet

We can find the area of a circle by using the following formula:

Area = pi × radius^2
A = pi × r^2

`a = \pi {r}^(2)`

In this particular question, we have the following data:

The area (A) is 254.34 square feet.

`a = 254 . 34`

Pi equals 3.14

`\pi = 3.14`

Now let's fill in the given formula.

`254.34 = 3.14 * r {}^(2)`

Divide both sides by pi (in other words: divide by 3.14).

`{r}^(2) = 81`

Now take the square root of both sides of the equation. We only need to find the positive solution of this equation, because a radius cannot be negative.

`r = √(81) = 9`

Therefore, the radius is 9 feet.
~ Hope this helps you!

Answer 2

Hey there! :)

The formula for finding area of a circle = π · r²

Area = 254.34

254.34 ÷ π = 81(rounded)

81 = r²

Find the square root of 81 to find r

√81 = 9

The radius is 9

Hope this helps :)