PPT: Heron's Formula | Mathematics (Maths) Class 9 PDF Download

 Page 1


H E R O N ’ S
F O R M U L A
Page 2


H E R O N ’ S
F O R M U L A
It is the outside boundary of any closed shape. To
find the perimeter we need to add all the sides of the
given shape.
P e r i m e t e r
The perimeter of a rectangle is the sum of its all sides.
Its unit is same as of its length.
Perimeter = 3 + 7 + 3 + 7 cm
Perimeter of rectangle = 20 cm
Page 3


H E R O N ’ S
F O R M U L A
It is the outside boundary of any closed shape. To
find the perimeter we need to add all the sides of the
given shape.
P e r i m e t e r
The perimeter of a rectangle is the sum of its all sides.
Its unit is same as of its length.
Perimeter = 3 + 7 + 3 + 7 cm
Perimeter of rectangle = 20 cm
A
B C
Area of any closed figure is the surface enclosed by the perimeter. Its unit is
square of the unit of the length.
Area
Area of a triangle
The general formula to find the area
of a triangle, if the height is given, is
Page 4


H E R O N ’ S
F O R M U L A
It is the outside boundary of any closed shape. To
find the perimeter we need to add all the sides of the
given shape.
P e r i m e t e r
The perimeter of a rectangle is the sum of its all sides.
Its unit is same as of its length.
Perimeter = 3 + 7 + 3 + 7 cm
Perimeter of rectangle = 20 cm
A
B C
Area of any closed figure is the surface enclosed by the perimeter. Its unit is
square of the unit of the length.
Area
Area of a triangle
The general formula to find the area
of a triangle, if the height is given, is
Area of a Right Angled Triangle
If we have to find the area of a right-angled
triangle then we can use the above formula
directly by taking the two sides having the right
angle one as the base and one as height.
Here base = 3 cm and height = 4 cm
Area of Triangle = 1 x 3 x 4
                    2
Area of Triangle =  6 cm
2
Page 5


H E R O N ’ S
F O R M U L A
It is the outside boundary of any closed shape. To
find the perimeter we need to add all the sides of the
given shape.
P e r i m e t e r
The perimeter of a rectangle is the sum of its all sides.
Its unit is same as of its length.
Perimeter = 3 + 7 + 3 + 7 cm
Perimeter of rectangle = 20 cm
A
B C
Area of any closed figure is the surface enclosed by the perimeter. Its unit is
square of the unit of the length.
Area
Area of a triangle
The general formula to find the area
of a triangle, if the height is given, is
Area of a Right Angled Triangle
If we have to find the area of a right-angled
triangle then we can use the above formula
directly by taking the two sides having the right
angle one as the base and one as height.
Here base = 3 cm and height = 4 cm
Area of Triangle = 1 x 3 x 4
                    2
Area of Triangle =  6 cm
2
H E R O N ’ S
F O R M U L A
The formula of area of a
triangle is given by heron
and it is also called H e r o n ’ s
F o r m u l a.
Area of Triangle
s is Semi-Perimeter
where a, b and c are the sides of the triangle