Class 9 Maths · Chapter 6 · CBSE / NCERT
Measuring Space: Perimeter and Area
Perimeter and area. You’ll learn the circumference and π, arc length, the areas of parallelograms, triangles (including Heron’s formula) and circles, and the area of a sector.
10 short lessons · about 39 minutes in all
What you’ll learn
- 1Walking round the edge: perimeter3 min
- 2Round a circle and across it: pi4 min
- 3Why pi never ends4 min
- 4How long is a slice of the crust?4 min
- 5Counting squares: area of a rectangle3 min
- 6Sliding a parallelogram into a rectangle4 min
- 7A triangle is half a rectangle4 min
- 8Area from three sides: Heron's formula5 min
- 9Slicing a circle into a rectangle4 min
- 10The area of a pizza slice4 min
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Walking round the edge: perimeter · about 3 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 5I’m Up and Down, and Round and Round10 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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