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Chapter 9: Area of Plane Figures

    Introduction

    Area of a Trapezium

    Area of a Quadrilateral

    Area of a Rhombus

    Surveying the Field

    Area of a Polygon

    Area of a Circle

    Area of a Circular Path or Area of a Ring

    Length of the Arc

    Area of Sector

    Exercise 9.1

    Exercise 9.2

    What We Have Discussed?

    Easy Level Worksheet

    Moderate Level Worksheet

    Hard Level Worksheet

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Chapter 9: Area of Plane Figures > Area of a Rhombus

Area of a Rhombus

Rhombus

A Rhombus is a quadrilateral that has four congruent sides. You might remember that every rhombus is a – and also a .

This means that to find the area of a rhombus, we can use either the equation for the area of a parallelogram, or that for the area of a kite:

Area = base × height = 12 d1 × d2.

Note: In different contexts, you might be given different parts of a Rhombus (sides, height, diagonals), and you should pick whichever equation is more convenient.