Class 9 Maths · Chapter 5 · CBSE / NCERT
I’m Up and Down, and Round and Round
Circles: chords, arcs and angles. You’ll learn how equal chords behave, the perpendicular from the centre, why the angle at the centre is double, and when four points lie on a circle.
10 short lessons · about 45 minutes in all
What you’ll learn
- 1Circle, radius, chord and diameter4 min
- 2How a circle matches itself4 min
- 3How many circles through some points5 min
- 4Equal chords, equal angles at the centre4 min
- 5The perpendicular from the centre5 min
- 6Equal chords, equal distances4 min
- 7The longer chord is nearer4 min
- 8The angle at the centre is double5 min
- 9Angles from the same side of a chord5 min
- 10Four corners on a circle5 min
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Circle, radius, chord and diameter · about 4 minutes
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More Class 9 Maths
The other 13 chapters.
CH 1Orienting Yourself: The Use of Coordinates8 lessonsCH 2Introduction to Linear Polynomials9 lessonsCH 3The World of Numbers10 lessonsCH 4Exploring Algebraic Identities9 lessonsCH 6Measuring Space: Perimeter and Area10 lessonsCH 7The Mathematics of Maybe: Introduction to Probability9 lessonsCH 8Predicting What Comes Next: Exploring Sequences and Progressions9 lessonsCH 9Propositions and their Converses12 lessonsCH 10How Quantities Combine: Understanding Data10 lessonsCH 11The World of Algorithms10 lessonsCH 12Quadrilaterals11 lessonsCH 13Two Variables, One Line12 lessonsCH 14Math of Space: Surface Area and Volume10 lessons
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