Surface Area of a Rectangle Formula
Geometry includes the study of a plethora of shapes in mathematics. Not only that, their dimensions and numerous calculations pertaining to their dimensions are also done under geometry.
A quadrilateral whose opposite sides are of equal lengths and all the four angles are right angles is called a rectangle. The figure given below depicts a rectangle. Observe how the opposite sides are equal to each- other and all the angles are 90°.
Area of a Rectangle
The area of a rectangle is given as:
A = l × b
where,
- l is the length of the rectangle
- b is the breadth of the rectangle
Sample Problems
Question 1. What would be the area of the rectangle whose length is 4 m and width is 9 m.
Solution:
Given: l = 4 m, b = 9 m
A = l x b
= 4 x 9
A = 36 m2
Question 2. Find the length of a rectangle if its area is 400 sq. units and width is 50 units.
Solution:
Given: A = 400 sq. units, b = 50 units
A = l x b
400 = l x 50
l = 400/50
= 8 units
Question 3. Find the width of a rectangle whose area and length are 100 sq. units and 25 units respectively.
Solution:
Given: A = 100 sq. units, l = 25 units
A = l x b
100 = 25 x b
b = 100/25
= 4 units
Question 4. What would be the area of the rectangle whose length is 10 m and width is 9 m?
Solution:
Given: l = 10 m, b = 9 m
A = l x b
= 10 x 9
A = 90 m2
Question 5. What would be the area of the rectangle whose length is 34 m and width is 39 m?
Solution:
Given: l = 34 m, b = 39 m
A = l x b
= 34 x 39
A = 1326 m2
Contact Us