Understanding Circumference

What is the circumference of a circle?

• The distance around the circle

• The area inside the circle

• The radius of the circle

• The diameter of the circle

How was the circumference of a circle historically estimated?

• By halving the diameter

• By squaring the radius

• By doubling the radius

• By tripling the diameter

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

• 2 * diameter

• pi * diameter

• pi * radius

• 2 * pi * radius

What value is commonly used for pi in calculations?

• 3.00

• 3.75

• 3.14

• 3.50

Which formula can be used to find the circumference using the radius?

• 2 * diameter

• 2 * pi * radius

• pi * diameter

• radius * diameter

When using the formula 2 * pi * radius, in what order can the factors be multiplied?

• Pi must be last

• Radius must be first

• Any order

• Only in the order given

What does it mean to solve for circumference in terms of pi?

• Substitute pi with 3.14

• Ignore pi completely

• Leave pi as it is

• Use pi as 3.00

Why is solving in terms of pi more accurate?

• Because pi is rounded

• Because pi is not altered

• Because pi is halved

• Because pi is doubled

What is the circumference of a circle with a diameter of 6 in terms of pi?

• 24 pi

• 18 pi

• 12 pi

• 6 pi

What is the circumference of a circle with a radius of 6 in terms of pi?

• 24 pi

• 18 pi

• 12 pi

• 6 pi