Area and Perimetre
Category : 4th Class
Area and Perimetre
Introduction
In the previous chapter we have studied about the shape and size of some geometrical figures. In this chapter we will study about area and perimetre of some close geometrical figures,
Area
Area is referred as the surface occupied by the geometrical shapes
Area of a Triangle
Area of a triangle
Where base is one side of a triangle and height is the length of altitude drawn from opposite vertex on the given base,
Area of the triangle
Where BC is the base and AD is the height,
Find the area of the triangle whose base is 5 cm and height is 8 cm.
Solution:
Area of the triangle
Area of a Rectangle
Area of a rectangle
Area of the rectangle
Find the area of the rectangle whose length is 9 cm and width is 7 cm,
Solution:
Area of the rectangle = 9 cm x 7 cm = 63 cm2
Area of a Square
Area of a square
Area of the square
Find the area of the square whose length of one side is 6 cm.
Solution:
Area of the square
Area of a circle
Area of the circle
Where
Find the area of the circle whose radius is 0.7 cm.
Solution:
Area of the circle
Perimetre
Perimetre is referred as the length of the boundary line which endorse the
Perimetre of the Triangles
Perimetre of a triangle = Sum of length of all three sides.
Perimetre of the triangle
Find the perimetre of the given figure.
Solution:
Perimetre of the figure
Perimetre of a Quadrilateral
The perimetre of a quadrilateral = Sum of the length of all four sides.
Perimetre of the quadrilateral
Find the perimetre of the quadrilateral whose lengths are and 5.2cm.
Solution:
Perimetre of the quadrilateral
Perimetre of a Rectangle
Perimetre of a rectangle
Perimetre of the rectangle
Find the perimetre of the rectangle whose length and breadth are 9 cm and 8 cm.
Solution:
Perimetre of the rectangle
Perimetre of a Square
Perimetre of a square = 4 length of one side of the square.
Perimetre of the square
Find the perimetre of the square whose length of one side is 4.25 cm.
Solution:
Perimetre of the square
Perimetre of a circle
Perimetre of a circle
Or Perimetre of a circle
Where
Or Perimetre of the circle
Find the perimetre of the circle whose radius is 10 cm.
Solution:
Perimetre the circle
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