Class 9 NCERT • Ganita Manjari Part II (New Syllabus)
Ch 12: Quadrilaterals
Select a topic or study module below to explore quadrilateral definitions, angle sum properties, parallelogram theorems, the midpoint theorem, special quadrilaterals like rhombuses and squares, plane tiling, and textbook solutions.
Topic 01 • Defining Quadrilaterals
Exploring Convex, Non-Convex, Vertices, and Adjacent/Opposite Sides & Angles
Topic 02 • Angle Sum Property
Analyzing the 360° Interior Angle Sum and Classifications of Four-Sided Figures
Topic 03 • Parallelogram Properties
Investigating Opposite Sides, Opposite Angles, and Diagonal Bisecting Theorems
Topic 04 • Parallelogram Tests
Proving When a Quadrilateral is a Parallelogram Using Side, Angle, and Diagonal Tests
Topic 05 • The Midpoint Theorem
Studying Line Segments Joining Side Midpoints and Their Relation to the Third Side
Topic 06 • Special Quadrilaterals
Examining Rectangles, Rhombuses, Squares, and Their Unique Diagonal Geometries
Topic 07 • Tiling & Tessellations
Exploring Plane Tiling, Angle Arrangements Around Vertices, and Tessellations
Module 08 • Solutions & Quiz