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Introduction
Lessons
Terms related to circles
Radius
Diameter
Circumference
Central angle
minor arc
major arc
Inscribed angle
Chord
perpendicular bisector
Tangent
point of tangency
How to find the length of an arc?
by Central angle
by Proportion
by Using formula a = Θr
Examples
Lessons
Find the length of the arc in red.
In the following circle, AD is diameter and BC ⊥ EF, and the radius is 7. Find the measures of:
arcAB
arcABE
arcAEC
∠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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