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- Circles

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Get Started Now- Intro Lesson7:40
- Intro Lesson: a7:35
- Intro Lesson: b8:35
- Lesson: 1a1:34
- Lesson: 1b1:57
- Lesson: 1c1:24
- Lesson: 2a1:46
- Lesson: 2b3:11
- Lesson: 2c2:59
- Lesson: 2d1:06
- Lesson: 34:28

- Introductiona)
**Terms related to circles**- Radius
- Diameter
- Circumference
- Central angle
- minor arc
- major arc
- Inscribed angle
- Chord
- perpendicular bisector
- Tangent
- point of tangency

b)How to find the length of an arc?- by Central angle
- by Proportion
- by Using formula a = Θr

- 1.Find the length of the arc in red.a)

b)

c)

- 2.In the following circle, AD is diameter and BC $\bot$ EF, and the radius is 7. Find the measures of:

a)$arc AB$b)$arc ABE$c)$arc AEC$d)$\angle BFD$ - 3.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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