Quadrilaterals · चतुर्भुज

Square, rhombus, kite or trapezium? Know them by their properties.

Quadrilaterals games

Shape	Sides	Angles	Diagonals
Parallelogram	Opposite sides equal and parallel	Opposite equal	Bisect each other
Rectangle	Opposite equal	All 90°	Equal, bisect each other
Rhombus	All equal	Opposite equal	Perpendicular bisectors
Square	All equal	All 90°	Equal, perpendicular bisectors
Trapezium	One pair parallel	—	—
Kite	Two pairs of equal adjacent sides	One pair equal	Perpendicular

Angle sum = 360°. Mid-point theorem: the segment joining mid-points of two sides of a triangle is parallel to the third side and half of it.

For Class 8 and 9 (NCERT Mathematics 9, “Quadrilaterals”; Ganita Prakash 8). Angle answers computed by a program.

A one-page chart to stick on the wall, and a worksheet to practise.

Angle sum 360°. Parallelogram, rectangle, rhombus, square, trapezium, kite.

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Name: ____________________ Class: ______ Date: __________

1. Three angles are 80°, 95°, 110°. Fourth = ____

2. Write two differences between a rhombus and a square.

3. Prove that the diagonals of a rectangle are equal.

4. Angles of a quadrilateral are in the ratio 3:5:9:13. Find them.

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