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.
$254.34 = 3.14 \times r {}^{2}$

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.
$r = \sqrt{81} = 9$

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 :)