All things Circle

What defines a circle in geometry?

• A shape with four equal sides

• A set of points all at the same distance from a center point

• A shape with one side and four corners

• A set of points forming a square

What is the distance from the center of a circle to any point on its edge called?

• Diameter

• Pi

• Circumference

• Radius

What is the diameter of a circle?

• The distance from one edge to another, not passing through the center

• Half of the radius

• Twice the radius

• The distance around the circle

What does Pi represent in relation to a circle?

• The ratio of the circumference to the diameter

• The ratio of the circumference to the radius

• The ratio of the radius to the diameter

• The ratio of the diameter to the circumference

Why is Pi considered an irrational number?

• Because its decimal representation is infinite and non-repeating

• Because it can be accurately calculated

• Because it represents the number of circles in the world

• Because it is a whole number

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

• Circumference = Pi * radius

• Circumference = Pi * diameter

• Circumference = 2 * Pi * radius

• Circumference = Pi * radius squared

What does squaring a radius mean?

• Multiplying the radius by 2

• Adding the radius to itself

• Dividing the radius by 2

• Multiplying the radius by itself

How do you find the area of a circle?

• Area = Pi * radius squared

• Area = Pi * diameter

• Area = Pi * radius

• Area = Pi * diameter squared

What is the diameter of the Earth used to calculate its circumference?

• 12,750 km

• 40,055 km

• 24 inches

• 452.16 square inches

If a pizza has a diameter of 24 inches, what is its radius?

• 12 inches

• 48 inches

• 24 inches

• 6 inches