Arcs of a circle

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Intros

Lessons

Terms related to circles
- Radius
- Diameter
- Circumference
- Central angle
- Inscribed angle
- Chord
- Tangent
How to find the length of an arc?
- by Central angle
- by Proportion
- by Using formula a = Θr

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Examples

Lessons

Find the length of the arc in red.
In the following circle, AD is diameter and BC $\bot$ $⊥$ EF, and the radius is 7. Find the measures of:
1. $arc AB$
2. $arc ABE$
3. $arc AEC$
4. $\angle BFD$
On circle D, arcAB= 105°, arcBC= 140° and arcABC= 245°. Point E is on the circle D too and arcCE= 145°. Explain what E must be on ArcAB.

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