Circles and Pi Quiz

What shape were ancient Greek astronomers first to discover celestial objects move on?

• Circular orbits

• Elliptical orbits

• Square paths

• Random paths

What is the distance from the center of a circle to its outer rim called?

• Arc

• Radius

• Diameter

• Circumference

What is the ratio between the circumference and the diameter of any circle?

• Pi

• 2

• 3

• 1

What is the formula for the circumference of a circle with diameter d?

• C = 2πr

• C = 2d

• C = πd

• C = πr^2

What shape has the largest area for a given circumference?

• Triangle

• Square

• Circle

• Rectangle

What type of number is Pi?

• Fraction

• Irrational number

• Integer

• Rational number

What is the approximate value of Pi?

• 3

• 3.14

• 22/7

• Both 3.14 and 22/7

What did Isaac Newton calculate about Pi?

• Its color

• Its shape

• Its first 4 digits

• Its first 15 digits

What is the measurement around the outside of a circle called?

• Diameter

• Circumference

• Radius

• Center

What is a straight line that goes through the center of a circle from side to opposite side?

• Diameter

• Circumference

• Radius

• Center