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- PSLE Maths
- Circles
Arcs of a circle
- 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
Arcs of a circle
Lessons
- 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 ⊥ EF, and the radius is 7. Find the measures of:
a)arcABb)arcABEc)arcAECd)∠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.