# Herons Formula class 9 Notes Mathematics

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## CBSE Guide Herons Formula class 9 Notes

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## 10 Mathematics notes Chapter 12 Herons Formula

Download CBSE class 9th revision notes for Chapter 12 Herons Formula in PDF format for free. Download revision notes for Herons Formula class 9 Notes and score high in exams. These are the Herons Formula class 9 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the best tips recommended by teachers during exam days.

CBSE Class 09 Mathematics
Revison Notes
CHAPTER 12
HERON’S FORMULA

1. Area of a Triangle – by Heron’s Formula

2. Application of Heron’s Formula in finding Areas of Quadrilaterals

• Triangle with base ‘b’ and altitude ‘h’ is

${\text{Area }} = \frac{1}{2} \times (b \times h)$

• Area of an isosceles triangle whose equal side is $a$ = ${{{a^2}} \over 2}$ square units
• Triangle with sides a, b and c

(i) Semi perimeter of triangle s =$\frac{{a + b + c}}{2}$

(ii) Area=$\sqrt {s(s - a)(s - b)(s - c)}$sq. unit

• Equilateral triangle with side ‘a’

Perimeter = $3a$ units

Altitude = ${{\sqrt 3 } \over 2}a$ units

${\text{Area }} = \frac{{\sqrt 3 }}{4}{{\text{a}}^2}{\text{ square units}}$

• Rectangle with length $l$, breadth $b$

Perimeter = $2\left( {l + b} \right)$

Area = $l \times b$

• Square with side $a$

Perimeter = $4a$ units

Area = ${a^2}$  sq. units

Area = ${\left( {{\rm{Diagonal}}} \right)^2}$ sq. units

• Parallelogra with length $l$, breadth $b$ and height $h$

Perimeter = $2\left( {l + b} \right)$

Area = $b \times h$

• Trapezium with parallel sides ‘a’ & ‘b’ and the distance between two parallel sides as ‘h’.

${\text{Area }} = \;\frac{1}{2}(a + b)h\;\;{\text{square units}}$

## Herons Formula class 9 Notes

• CBSE Revision notes (PDF Download) Free
• CBSE Revision notes for Class 9 Mathematics PDF
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• Short notes for CBSE class 9th Mathematics
• Key notes and chapter summary of Mathematics class 9
• Quick revision notes for CBSE board exams

## CBSE Class-10 Revision Notes and Key Points

Herons Formula class 9 Notes. CBSE quick revision note for Class-10 Mathematics, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

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