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Area of a Parallelogram



 

b: length of the base
h: height of the parallelogram
A: Area

The area of a parallelogram is given by:
A = b ∙ h

 

Example 1:

Find the area of a parallelogram with base 24 m and height 17 m.
Solution:

 

A = bh

A =24 * 17

A = 408 m2

 

 

Example 2: The base of a parallelogram is 15 cm and the height is 10cm. What are the area and perimeter of this parallelogram?

Solution: We know the area is

 

A = bh
A = 15 * 10
A = 150cm2

 

As show below we do not have any information about the left and right sides.

 

Thus, we cannot determine the perimeter.

 

 

Example 3: A parallelogram has a base of 3x, a height of x, and the other side of the parallelogram (not the base) is 2x. If the area of this parallelogram is 15, what is its perimeter?

 

Solution:

 

Notice in the diagram that we know enough information to formulate an equation for the area of the parallelogram.

 

A = bh = (3x)x = 3x2
A = 15

3x2 = 15
x2 =  5

x = √5

 

Since x = √5, we know the height h = √5, the base b = 3x = x√5 and the other side is 2x = 2√5.

 

The perimeter is the sum of the four sides, namely the two bases and two other sides. 

Perimeter = 2 * (3 * √5) + 2 * (2 *√5 ) = 10√5

 

 

Example 4: A parallelogram is 3 yards long. The height, measured perpendicular to this side, is 1.5 yards. What is the area?

Solution: Since they are perpendicular, the side measurement and the height can be used in the formula.

A = 3 * 1.5

A = 4.5 square yards.

 

Example 5: Determine the area of a parallelogram that is 5 m high whereas the base is 9 m long.

A = b ∙ h = 9 ∙ 5 = 45 m2

 



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