Herons Formula - Revision Notes
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
- Area of an isosceles triangle whose equal side is = square units
- Triangle with sides a, b and c
(i) Semi perimeter of triangle s =
(ii) Area=sq. unit
- Equilateral triangle with side 'a'
Perimeter = units
Altitude = units
- Rectangle with length , breadth
Perimeter =
Area =
- Square with side
Perimeter = units
Area = sq. units
Area = sq. units
- Parallelogra with length , breadth and height
Perimeter =
Area =
- Trapezium with parallel sides 'a' & 'b' and the distance between two parallel sides as 'h'.