If you have a circle with an area of approximately 45 square feet, what is a good estimation for the radius of the circle?(4 points)

Step 1: What is the formula for finding the area of a circle? Response area

Step 2: What would be the first step in solving for the radius? Response area

Step 3: What would be the second step in solving for the radius? Response area

Step 4: The approximate radius would be about Response area

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1 answer

Certainly! Let's go through each of the steps together.

Step 1: What is the formula for finding the area of a circle?

The formula for the area \( A \) of a circle is given by: \[ A = \pi r^2 \] where \( r \) is the radius of the circle and \( \pi \) is approximately 3.14.

Step 2: What would be the first step in solving for the radius?

The first step in solving for the radius is to rearrange the formula to solve for \( r \). You can do this by dividing both sides by \( \pi \): \[ r^2 = \frac{A}{\pi} \]

Step 3: What would be the second step in solving for the radius?

The second step is to take the square root of both sides to solve for \( r \): \[ r = \sqrt{\frac{A}{\pi}} \]

Step 4: The approximate radius would be about

Given that the area \( A \) is approximately 45 square feet, we can substitute that value into the rearranged formula: \[ r \approx \sqrt{\frac{45}{\pi}} \] Using \( \pi \approx 3.14 \): \[ r \approx \sqrt{\frac{45}{3.14}} \approx \sqrt{14.33} \approx 3.79 \text{ feet} \]

So, a good estimation for the radius of the circle would be about 3.8 feet.