Radius and Diameter

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​Distance from the center to the edge of a circle.

​Distance across the entire circle, crossing through the center. (double the radius)

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​The CIRCUMFERENCE is the distance around a circle!

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​Now we will use our RADIUS to find CIRCUMFERENCE!

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​What is pi?

​Now we will use our DIAMETER to find CIRCUMFERENCE!

Multiple Choice

Find the circumference of the circle.

• 31.4 cm

• 78.5 cm

• 314 cm

• 15.7 cm

Multiple Choice

Find the circumference of the circle.

• 78.5 cm

• 15.7 cm

• 7.85 cm

• 19.6 cm

Multiple Choice

Find the circumference of the circle.

• 18.8 cm

• 113 cm

• 37.7 cm

• 452.2 cm

​What if I am given the circumference first, and I need to find the radius?

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​What about the diameter?

Draw

What is the circumference of this circle?

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