Find the area of each. Round your answer to the nearest tenth. radius = 12 km radius = 3 m radius = 8 cm diameter = 12 ft diameter = 23.2 yd radius = 11 m radius = 10 yd diameter = 11.2 in diameter = 12.8 yd diameter = 14 km

To find the area of a circle, you can use the formula:

[

text{Area} = pi r^2

]

where ( r ) is the radius of the circle. If you have the diameter, remember that the radius is half of the diameter:

[

r = frac{text{diameter}}{2}

]

Now, let’s calculate the area for each case:

1. Radius = 12 km:

[

text{Area} = pi (12)^2 approx 452.4 text{ km}^2

]

2. Radius = 3 m:

[

text{Area} = pi (3)^2 approx 28.3 text{ m}^2

]

3. Radius = 8 cm:

[

text{Area} = pi (8)^2 approx 201.1 text{ cm}^2

]

4. Diameter = 12 ft:

[

r = frac{12}{2} = 6 text{ ft}

text{Area} = pi (6)^2 approx 113.1 text{ ft}^2

]

5. Diameter = 23.2 yd:

[

r = frac{23.