Circles and circumference

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Intros

Lessons

Terms related to circles
- Radius
- Diameter
- Circumference
- Central angle
- Inscribed angle
- Chord
- Tangent

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Examples

Lessons

Find the circumferences of the following circles.
Find the radius (r).
$\overline {CD}$ $\overline{C D}$ and $\overline {CE}$ $\overline{CE}$ are radii of circle C.
1. If CD = 15 cm, what is CE?
2. If DF is the diameter of circle C, find its length.
3. Find the circumference of circle C.
Find the circumference of the circle.
The wheels of David's bicycle have a radius of 9 inches. How far has David traveled if the wheels have made 120 revolutions?

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