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Area of Parallelogram

Parallelogram

A parallelogram is a quadrilateral (four sides) shape with two pairs of parallel lines. The opposite sides and congruent angles are equal in measure. The sum of the interior angles is 360°. The following shapes are special types of parallelogram:

  • Rhombus
  • Square
  • Rectangle
  • Rhomboid

Properties of Parallelogram

  • Opposite sides are congruent, AB = DC
  • Opposite angles are congruent D = B
  • If one angle is right, then all angles are right.
  • The diagonals cross each other at a point.

Area of Parallelogram Formula

To find the area of parallelogram multiply the base by its height and vice versa. In other words, the area of a parallelogram is base times height.

Area of Parallelogram

Note: The base and height should be perpendicular.

A = base (b) * height (h)

Where b is the length of the base, and h is the height of altitude.

Note: We use the same formula to calculate the area of a parallelogram and a rectangle. The reason for using the same formula is that every parallelogram can be converted into a rectangular shape.

Area of Parallelogram

The area of a parallelogram is the region covered by the parallelogram in the 2D plane.

Derivation

We can derive the formula by using the following steps:

  • Draw a parallelogram whose base is b altitude is h.
  • Cut a triangular shape from the parallelogram.
  • Move the triangular part to create a rectangle.

When we have done with all the above steps, it forms a rectangular shape. The area of the newly created rectangle will be the same as a parallelogram.

Area of Parallelogram

Hence, the area of a parallelogram (A) is = b* h

The parallelogram and rectangle have the same properties. So, the area of the parallelogram will be equal to the area of the rectangle.

Let's see some examples and find the area of a parallelogram.

Example 1: If the base of a parallelogram is 17 cm and height is 7 cm. Find the area.

Area of Parallelogram

Solution:

We have given b=17 cm and h=7 cm.

We know that,

Area of a parallelogram (A) = b * h

A = 17 * 7

A = 119 cm2

The area of the parallelogram is 119 cm2.

Example 2: Find the area of the parallelogram given below.

Area of Parallelogram

Solution:

From the above figure, b=6 cm. and h=12 cm.

We know that,

Area of a parallelogram (A) = b * h

A = 6 * 12

A = 72 cm2

The area of parallelogram is 72 cm2.

Area of a parallelogram when the height is not given

We use trigonometry formula to find the area of a parallelogram if the height of the is not given in the question.

Area of Parallelogram (A) = a * b sin (x)

Where a and b are the length of parallel sides, and x is the angle between two sides.

Example 3: The length of the parallel sides is 7 cm and 9 cm, respectively, and the angle between the sides is 90°. Find the area of the parallelogram.

Solution:

We have given, a = 7 cm., b = 9 cm. and x =

We know that,

Area of parallelogram (A) = a * b sin (x)

A = 7 * 9 sin (90)

A = 63 sin 90

A = 63 * 1 = 63 sq.cm.

The area of the parallelogram is 63 sq. cm.


Next TopicArea of a Cylinder




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