Area and Circumference of a Circle

What does the term 'radius' mean in relation to a circle?

• The radius is the distance from the center of the circle to any point on its circumference.

• The radius is the total distance around the circle.

• The radius is the line segment that connects two points on the circle.

• The radius is the area enclosed by the circle.

What is the circumference of a circle with a radius of 4 inches?

• 20.00 in.

• 25.12 in.

• 30.00 in.

• 15.70 in.

What is the area of a circle with a radius of 5 inches?

• 31.42 in²

• 62.83 in²

• 78.54 in²

• 100.00 in²

Find the area of a circle with a diameter of 12 inches.

• 113.10 in²

• 75.40 in²

• 113.00 in²

• 78.54 in²

Calculate the circumference of a circle with a radius of 10 inches.

• 31.42 in.

• 62.83 in.

• 78.54 in.

• 50.27 in.

If the radius of a circle is 7 inches, what is the diameter?

• 10 inches

• 12 inches

• 14 inches

• 16 inches

What is the approximate value of π (pi)?

• 2.71

• 3.14

• 3.33

• 3.00

Calculate the area of a circle with a radius of 3 inches.

• 28.27 in²

• 31.42 in²

• 18.85 in²

• 12.57 in²

What is the formula to calculate the circumference of a circle?

• Circumference = πd

• Circumference = 2πr

• Circumference = 3πr

• Circumference = 4πr

If the radius of a circle is doubled, how does the area change?

• The area remains the same.

• The area increases by a factor of two.

• The area increases by a factor of four.

• The area decreases by a factor of four.