Let's solve each part of your question one at a time.
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Circumference of a circle with radius 63:
The formula for circumference \(C\) is: \[ C = 2 \pi r \] Using \(r = 63\) and \(\pi = 3.14\): \[ C = 2 \times 3.14 \times 63 = 6.28 \times 63 = 395.64 \] So, the approximate circumference is 395.64.
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Circumference of a circle with diameter 20:
The formula for circumference is also: \[ C = \pi d \] Using \(d = 20\): \[ C = 3.14 \times 20 = 62.8 \] So, the approximate circumference is 62.8.
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Diameter from circumference of 574 meters:
We can use the circumference formula to find diameter: \[ C = \pi d \quad \Rightarrow \quad d = \frac{C}{\pi} \] Using \(C = 574\) and \(\pi = 3.14\): \[ d = \frac{574}{3.14} \approx 183.29 \] Rounded to the nearest tenth, the diameter is 183.3 meters.
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Circumference of a circle with radius 38 inches:
Using the circumference formula: \[ C = 2 \pi r \] Using \(r = 38\): \[ C = 2 \times 3.14 \times 38 = 6.28 \times 38 = 238.64 \] So, the approximate circumference is 238.64 inches.
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Area of a circle with radius 75 mm:
The area \(A\) is calculated using the formula: \[ A = \pi r^2 \] Using \(r = 75\): \[ A = 3.14 \times (75)^2 = 3.14 \times 5625 = 17625 \] So, the approximate area is 17625.0 mm².
To sum up, here are the answers:
- 395.64
- 62.8
- 183.3
- 238.64
- 17625.0