5.5 Area of Parallelogram Lesson

5.5 Area of Parallelogram Lesson

Parallelograms

• All of these shapes are considered parallelograms.

• These get their names because "opposite sides are parallel". For instance, a rectangle, the top and bottom sides are parallel...they will never touch. Same with the left and right sides of it.

Difference between perimeter and area

• With perimeter, we were concerned about the 'outside' distance around a shape

• With area, we are now concerned with how many square units are within a shape.

• For example, perimeter is how much fence we would need for a garden, and area is how much garden we have inside the fence.

Area of Parallelograms

•  $A=b\cdot h$  

• Notice how our 'h' is a true height...not the fake 'slant height'.

Fill in the Blanks

Find the area of this parallelogram. Don't include units

Same idea for rectangles and squares

• Take our base (5) and multiply by its true height (3)

•  $5\cdot3=15\ ft^2$  

Fill in the Blanks

Find the area of this parallelogram - no units

Try this challenge!

• Hint: Cut this into two shapes, then find the areas and add together

•  $A=120+600=720in^2$  

Show me your notes when you are finished