Class 9 Maths · Chapter 12 · CBSE / NCERT
Quadrilaterals
Proving facts about quadrilaterals. You’ll learn the properties of parallelograms and the tests that prove a shape is one, the midpoint theorem, medians and the centroid, and tiling with any quadrilateral.
11 short lessons · about 47 minutes in all
What you’ll learn
- 1What makes a four-sided figure a quadrilateral4 min
- 2Convex and dented quadrilaterals4 min
- 3What is always true in a parallelogram4 min
- 4Tests that prove a parallelogram5 min
- 5The one equal parallel pair test4 min
- 6Rectangles, rhombuses and squares4 min
- 7The midpoint theorem5 min
- 8The midpoint theorem the other way round4 min
- 9Medians and the centroid5 min
- 10The midpoint quadrilateral4 min
- 11Tiling a floor with any four-sided tile4 min
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What makes a four-sided figure a quadrilateral · 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 5I’m Up and Down, and Round and Round10 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 13Two Variables, One Line12 lessonsCH 14Math of Space: Surface Area and Volume10 lessons
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