Sir Cumference and the Dragon of Pi- Happy Pi Day!

What is the measure across the middle of a circle called?

• Radius

• Circumference

• Diameter

• Pi

​ The ​ ​ (a)   is the distance across a circle. Three and ​ (b)   times its length is the ​ (c)   of the circle, which is the distance around the outer edge .

• diameter
• 1/7
• circumference

The ​ (a)   letter of the Greek alphabet is used to represent​ (b)   , which is ​about (c)   or ​ (d)   continuing as a decimal. ​ ​

• sixteenth
• pi
• 3 and 1/7
• 3.14159

Pi times the diameter of a circle is equal to the circles _____.

• area

• radius

• 3.14159

• circumference