Area of Square
Calculate the area of a square of side 13 cm.
Area of a square = side × side
= 13 × 13
= 169 .
Area of Rectangle
Find the area of a rectangle whose length and breadth are 20 cm and 12 cm respectively.
Length of the rectangle = 20 cm
Breadth of the rectangle = 12 cm
Area of the rectangle = length × breadth
= 20 cm × 12 cm
= 240 sq. cm.
Area of a triangle
Area of triangle = × base × height = × b × h
Areas of different types of triangles
Consider an acute and an obtuse triangle.
Area of each triangle = × base × height = × b × h
Visualization of Area
Area of irregular shapes
The area of an irregular figure can be calculated by:
Step 1: Divide the irregular shape into regular shapes that you can recognize (eg. triangles, rectangles, circles, and squares)
Step 2: Find the area of these individual shapes and add them. The sum will be the area of the irregular figure.