Answer:

Sure, I can help you with that. To find the area of a circle, you need to use the formula A = πr², where A is the area and r is the radius of the circle.

Using this formula, the answers for the given circle radii are:

1. A circle with a radius of 24 meters has an area of 1,809.56 square meters (rounded to two decimal places).

2. A circle with a radius of 18 centimeters has an area of 1,017.88 square centimeters (rounded to two decimal places).

3. A circle with a radius of 12 feet has an area of 452.39 square feet (rounded to two decimal places).

4. A circle with a radius of 16 meters has an area of 804.25 square meters (rounded to two decimal places).

5. A circle with a radius of 20 centimeters has an area of 1,256.64 square centimeters (rounded to two decimal places).