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
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
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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.