Mrs. Planavsky 4 th Grade.  Find the circumference of a circle  Find the measurement of a diameter of the circle.

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Presentation transcript:

Mrs. Planavsky 4 th Grade

 Find the circumference of a circle  Find the measurement of a diameter of the circle

 The circumference of a circle is the distance around the circle.

 If you know the diameter of a circle, you can estimate its circumference!  You can find the EXACT measurement of the circumference of a circle by multiplying the diameter and pi (3.14).

A diameter is a chord that passes through the center of a circle.

CircleDiameterEstimated Circumference A2 cm B4 cm C7 cm D8 cm

12 ft

 How do you know?

10 cm

 How do you know?

10 cm..

 How did you figure this one out?  What new information did you learn about finding the circumference?

 Half of the diameter is called the radius  So, 2 x radius= diameter