# MENSURATION CLASS 7

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## What is MENSURATION ?

Mensuration means study of geometric shapes with respect to Length, width,height, area and volume.

Lets find out the area of the following shapes

• Square
• Rectangle
• Triangle
• Circle

#### Square : Square has all equal sides

• Side of square is denoted by “A” means Length = A and Width =A
• Perimeter of square is the length of periphery . i.e A+A+A+A =4A
• Area of square – Length X width = A x A

#### Rectangle – Rectangle has two opposite equal.

• Length of Long side = A and Length of short side = B
• Perimeter of rectangle – A + B + A+ B = 2A + 2B
• Area of rectangle = Length X Width = A X B

#### Triangle – Triangle has three side and they may or may not be equal.

• Width of triangle – B and height of triangle – H
• Considering all sides are equal in this case as “B” – Perimeter of triangle shall be B + B + B = 3 B .
• Area of triangle = 0.5 X B X H

#### Circle – Circle doesnt have any length and width as it is in circular shape and it has diameter or half the diameter as radius.

• Diameter of circle = D and Radius of circle = D/2
• Perimeter of circle = “Pi” X D ; Pi is a constant and its value is 3.1413
• Area of circle = Pi/4 X D^2

Worth Sharing !