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Chapter 9: Perimeter and Area

    Introduction

    Area of a Parallelogram

    Area of a Triangle

    Circles

    Area of Circle

    Exercise 9.1

    Exercise 9.2

    What Have We Discussed ?

    Extra Curriculum Support

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Chapter 9: Perimeter and Area > What Have We Discussed ?

What Have We Discussed ?

1. Area of a = base × height.

2. Area of a triangle = \frac{1}{2} (area of the generated from it)

= \frac{1}{2} × ×

3. The distance around a circular region is known as its .

Circumference of a circle = πd, where d is the diameter of a circle and π = \frac{22}{7} or 3.14 (approximately).

4. Area of a circle = πr2, where r is the radius of the .