Surface Area of Rectangle

Before finding the surface area of a rectangle, let’s recall what a rectangle is. It would be easy to understand the concept better if we know the basics of it first.

Definition of a Rectangle

A rectangle is a two dimensional figure with opposite sides equal and parallel to each other. Al so all the four angles of the rectangle of a right angle i.e 90 degrees.

Formula for area of a rectangle

The surface area of a rectangle can be found by the formula

Surface area of a Rectangle = L × B, where L is the length of the Rectangle and B is the breadth of the rectangle.

The unit for the surface area of a rectangle is cm2 or m2.

Examples of Surface area of a Rectangle

Problem: Find the area of a rectangle whose length is 6 cm and breadth is 3 cm?

Solution: The surface area of a rectangle is found by using the formula l × b.

The length , l in this question is 6 cm and breadth, b is 3 cm.

A = l ×b = 6cm × 3cm = 18 cm2

Problem: Find the area of a rectangle whose length is 16 cm and breadth is 5 cm?

Solution: The surface area of a rectangle is found by using the formula l × b.

The length , l in this question is 16 cm and breadth, b is 5 cm.

A = l ×b = 16 cm × 5 cm = 80 cm2

Problem: Find the length of a rectangle whose area is 27cm2 and breadth is 3 cm?

Solution: The surface area of a rectangle is found by using the formula l × b.

The length , l in this question is to be found out and breadth , b is 3 cm.

A = l × b

27 cm2 = l × 3 cm

l = 27 / 3 = 9 cm

So, the length of the rectangle with an area of 27 cm2 is 9 cm.

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Practise This Question

It is not possible to draw the perpendicular bisector of a line segment using a protractor ruler with no markings on it.