Parts of a Circle and Pi

Circumference, Radius, Diameter, Pi Match together the terms to their descriptions. Pi 3.14 Circumference Distance around a circle Radius Half the diameter Diameter 2 times the radius Radius and Diameter Click on the flashing circle and type the number answer in the box. DO NOT include the units for this activity. 5 10 8 16 9 18 6 12 Circle Parts Draw a circle. Label it's radius, diameter, and circumference. Fill in the blanks The perimeter of a circle is called it's circumference. A line that goes from the edge of a circle, through the center to the other side is called diameter. Radius is half the diameter. To find pi, you need to divide circumference by diameter. Pi is approximately 3.14. Pi or Not Pi? Sort the ratios according to whether they are equal to pi (3.14). Use a calculator to help! Pi (3.14) Circumference ÷ Diameter 87.92 ÷ 28 47.1 ÷ 15 Not Pi Diameter ÷ Circumference 9.42 ÷ 3.14 94.2 ÷ 28