Pi and Parts of a Circle

Pi and Parts of a Circle

By Courtney Tout

• ​Circumference- the distance around a circle

• Diameter - the distance from the edge through the center to the other edge of a circle

• Radius - the distance from center to the edge

• Center - the middle most point of a circle​

Parts of a Circle

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Multiple Choice

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

• Diameter

• Circumference

• Radius

• Center

Multiple Choice

What is the line that goes from the center of a circle to any point on the circle?

• Diameter

• Circumference

• Chord

• Radius

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Multiple Choice

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

Multiple Choice

What is the point that is an equal distance from all the points on a circle? (this is where your finger holds the compass)

• Diameter

• Circumference

• Center

• Chord

Multiple Choice

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

• Diameter

• Circumference

• Radius

• Center

Multiple Choice

What is the line that goes from the center of a circle to any point on the circle?

• Diameter

• Circumference

• Chord

• Radius

​Diameter is 2 times the size of the radius.

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Radius is half the size of the diameter.​

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Radius Vs Diameter

Multiple Choice

What is twice as long as a radius

• Center
• Diameter
• Tanget
• Arc

Multiple Choice

What is half as long as the diameter?

• Center
• Diameter
• Radius

• Circumference

Multiple Choice

What is the diameter?

• 5 in
• 10 in
• 3.14 in
• 15.84 in

Multiple Choice

If the diameter of a circle is 10 cm, the radius is 5 cm.

• TRUE
• FALSE

Multiple Choice

What is the diameter of a circle with a radius of 8 in?

• 4 in
• 16 in
• 32 in

​The ratio of a circles circumference and its diameter is known as pi:​

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​​Pi

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• When given a multiple of 7, use:

Values of Pi:

​

• Any other time, use:

Multiple Choice

What is this symbol called?

• pi

• sigma

• radius

• omega

Multiple Choice

What is the approximate numerical value of this sign?

• 3.11

• 3.14

• 4.13

• 6.28

Multiple Choice

What is the actual definition of this sign?

• It's the line going across the circle and going through the center

• It's the line going from the center to the edge of a circle

• It's the ratio of the circumference to the diameter of a circle.

• It's any line that goes through the circle but doesn't go through the middle.

Multiple Choice

The equation C = πd, is used to find the circumference of a circle given it's diameter. This formula can be rearranged to solve for pi. Which equation is written correctly to solve for pi?

• π = Cd

• π = C ÷ d

• π = d ÷ c

• π = C - d

Multiple Choice

Which of these ratios is the closest approximation of pi?

• 13/4

• 16/5

• 19/6

• 22/7

Multiple Choice

The symbol for Pi is

• π
• Σ
• Ψ
• ⊈

Multiple Choice

The diameter of a circular pool is 24.8 feet and the circumference is 77.9 feet. What should you do to find π?

• 77.9 / 24.8

• 24.8 / 77.9

Multiple Choice

Th distance around the circular cake is 9.42 inches. The distance across the cake is 3 inches. What happens when you divide 9.42 by 3?

• You get the area of the circle

• You get pi

• You get the diameter of the circle