Lesson
To develop a formula to find the area of a parallelogram, cut a triangle from one end of the parallelogram and shift it to the opposite side of the parallelogram to make a rectangle.
Then use the following formula:
| A = b x h |
Example
Find the area of the parallelogram.
Explanation
Area of a parallelogram = base of the parallelogram the perpendicular height
A = bh
Substitute given values into the formula.
A= 5x12
A = 60m²
Question
Find the base length of the parallelogram if the area is equal to 67.5cm²
Explanation
Recall the formula for the area of a parallelogram.
A = b x h
Using this.
67.5 = b x 15
4.5 = b
Therefore, the base of the parallelogram is equal to 4.5cm.
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