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### Unit 5: Lesson 2

Area of parallelograms and triangles

# Area of parallelograms

Understand how to find the area of a parallelogram and why it works.

## Intuition for why the area of a parallelogram is $A=bh$A, equals, b, h

The formula for the area of a parallelogram is base times height, just like the formula for the area of a rectangle.
But wait! Why are the formulas the same? Look what happens when we slide part of the parallelogram to the right.
Genius! We made the parallelogram into a rectangle.
Key intuition: We can make every parallelogram into a rectangle, which is why we use the same formula to find the area of a parallelogram and a rectangle.

## Practice problem 1

Find the area of the parallelogram.
square units

## Practice problem 2

Find the area of the parallelogram.
square units