Understanding the Area of a Circle

What is the formula for finding the area of a circle when the radius is given?

• Area = pi * diameter

• Area = pi * radius^2

• Area = pi * diameter^2

• Area = pi * radius

If the radius of a circle is 3, what is the area of the circle?

• 9 * pi

• 6 * pi

• 12 * pi

• 3 * pi

What is the relationship between the diameter and the radius of a circle?

• Diameter is twice the radius

• Diameter is half the radius

• Diameter is equal to the radius

• Diameter is three times the radius

What is the formula for finding the area of a circle when the diameter is given?

• Area = pi * diameter^2 / 2

• Area = pi * diameter / 2

• Area = pi * diameter^2

• Area = pi * diameter^2 / 4

If the diameter of a circle is 6, what is the area of the circle?

• 12 * pi

• 36 * pi

• 9 * pi

• 18 * pi