Exploring Circles: Radius, Diameter, and Circumference

What defines the radius of a circle?

• The distance from the center to any point on the circle

• The distance across the circle through the center

• The length around the circle

• The area of the circle

How is the diameter of a circle related to its radius?

• Diameter is half the radius

• Diameter is equal to the radius

• Diameter is the square root of the radius

• Diameter is twice the radius

What is the circumference of a circle?

• The distance from the center to the edge

• The length around the circle

• The distance across the circle through the center

• The area inside the circle

What is the approximate value of pi?

• 3

• 3.14

• 22/7

• All of the above

Why is pi considered a special number?

• It is the same for all shapes

• It is a whole number

• It represents the area of a circle

• It is an irrational number that represents the ratio of circumference to diameter

How can the circumference of a circle be calculated?

• Pi times the diameter

• Pi divided by the diameter

• Pi times the radius squared

• 2 times pi times the radius

If a circle's radius is 3 meters, what is its diameter?

• 1.5 meters

• 3 meters

• 6 meters

• 9 meters

What is the circumference of a circle with a radius of 3 meters?

• 18 pi meters

• 12 pi meters

• 9 pi meters

• 6 pi meters

If the circumference of a circle is 10 meters, what is its diameter?

• 10/pi meters

• 5/pi meters

• 10 meters

• 20/pi meters

What is the radius of a circle whose circumference is 10 meters?

• 2.5/pi meters

• 10/pi meters

• 5/pi meters

• 5 meters