PI Day!

What is a circle defined as in geometry?

• A shape with one curved side

• A polygon with infinite sides

• The set of all points equidistant from another point

• A shape with four equal sides

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What is the center of a circle?

• The line dividing the circle in half

• The outer edge of the circle

• The point exactly in the middle of the circle

• The point one radius away from the edge

How many radius lines can you draw in a circle?

• Two

• As many as you want

• Only one

• None

What is the diameter of a circle?

• The distance from the center to the edge

• Half the distance across the circle

• The distance around the circle

• The distance across the circle through the center

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CCSS.HSG.C.A.2

What special name is given to the perimeter of a circle?

• Radius

• Diameter

• Circumference

• Arc

What does the Greek letter for Pi represent?

• The number of times a circle's diameter fits around its circumference

• The radius of any circle

• The area of any circle

• The diameter of any circle

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What is Pi?

• A variable number that changes with the size of the circle

• The radius of a circle

• A constant number representing the ratio of circumference to diameter of any circle

• The diameter of a circle

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CCSS.HSG.GMD.A.1

How many diameters does it take to go around a circle's circumference?

• Exactly 2

• About 3.14

• More than 4

• Exactly 3

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Why is Pi considered an irrational number?

• Because it can be exactly calculated

• Because it has a finite number of decimal places

• Because it is a whole number

• Because its decimal digits never end and never repeat

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Why do we use a symbol to represent Pi in equations?

• Because it changes with each circle

• To make math problems harder

• Because it is easier to write than its numerical value

• To represent its true value, which is infinitely accurate

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