Circles Quiz

What is the formula for finding the circumference of a circle?

• Circumference = Pi × radius

• Circumference = Pi × diameter

What does it mean to 'square' the radius?

• Multiply the radius by 2

• Multiply the radius by itself

Which formula is used to find the area of a circle?

• Area = Pi × radius squared

• Area = Pi × diameter

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

• Diameter is twice the radius

• Diameter is half of the radius

Why is the unit for area different from the unit for circumference?

• Area is a 2-dimensional quantity, while circumference is 1-dimensional

• Area is measured in meters, while circumference is measured in centimeters

A circle has a radius of 12 in

Find the diameter of the circle

D = 2R

Mathematical Equivalence

OFF

A circle has a radius of 12 in

Find the circumference of the circle

C = π D or C = π 2R

*Use 3.14 for π

Mathematical Equivalence

ON

A circle has a radius of 12 in

Find the Area of the circle

A = π R²

*Use 3.14 for π

Mathematical Equivalence

ON

A circle has a radius of 4.4 cm

Find the diameter of the circle

D = 2R

Mathematical Equivalence

ON

A circle has a radius of 4.4 cm

Find the circumference of the circle

C = π D or C = π 2R

*Use 3.14 for π

(Round to the hundredths place)

Mathematical Equivalence

ON