Area of a piecewise rectangular figure



In this lesson we find the area of given piecewise rectangular figures. The figures are broken down into two or more rectangles and their areas are found. The sum of the areas of these rectangles gives the area of the piecewise rectangular figure.

Consider the following piecewise rectangular figure. We have to find its area.

Area of a piecewise rectangular figure

This figure can be considered as being made of two rectangles of dimensions 7 × 2 and 3 × 3 or 5 × 3 and 4 × 2

Finding the areas of the set of two rectangles gives the area of the piecewise rectangular figure.

Area = 7 × 2 + 3 × 3 14 + 9 = 23 square units

Area = 5 × 3 + 4 × 2 = 15 + 8 = 23 square units

Find the area of piecewise rectangular figure given below.

Area of a piecewise rectangular figure Example1

Solution

Step 1:

Area of a rectangle = l × w; l = length; w = width

Step 2:

Area of 2 piecewise rectangles = 3 × 3 + 7 × 2 = 23 square units

Find the area of piecewise rectangular figure given below.

Area of a piecewise rectangular figure Example2

Solution

Step 1:

Area of a rectangle = l × w; l = length; w = width

Step 2:

Area of 2 piecewise rectangles = 4 × 9 + 10 × 4 = 76 square units



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