Find the area of each circle with the given radius or diameter.

Question

Use 3.14 for pi.

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r = 4 in
r = 2 in
d = 2 in
The option "12.56 <math><msup><mi>in</mi><mn>2</mn></msup></math>" (3 of 4) has been selected. Press tab to choose a response area, and spacebar to insert it. Press escape to cancel.

Answer 1

To find the area of each circle, we use the formula:

\[ \text{Area} = \pi r^2 \]

Given that we will use \( \pi = 3.14 \), let's calculate the area for each case:

1. For r = 4 in: \[ \text{Area} = 3.14 \times (4^2) = 3.14 \times 16 = 50.24 , \text{in}^2 \]

2. For r = 2 in: \[ \text{Area} = 3.14 \times (2^2) = 3.14 \times 4 = 12.56 , \text{in}^2 \]

3. For d = 2 in (which means r = 1 in, since the radius is half the diameter): \[ \text{Area} = 3.14 \times (1^2) = 3.14 \times 1 = 3.14 , \text{in}^2 \]

Now, the areas for each circle are:

• For r = 4 in: 50.24 in²
• For r = 2 in: 12.56 in²
• For d = 2 in: 3.14 in²

You can select the appropriate responses based on these calculations.