Do Now

What are the following formulas?

Area of a Square:Area of a Rectangle:Area of a Parallelogram:Area of a Triangle: Area of a Trapezoid:Area of a Circle:

Area of Parallelograms

Learning Objectives:• Find the area of parallelograms.• Apply formulas to solve real-world and mathematical problems.

Area of Parallelograms

The Area of a figure is the number of square units it encloses.

On your graph paper, draw a rectangle 8 units long and 6 units high. How many square units are enclosed by your rectangle?

How did you determine you answer? - count the square inside the rectangle?

The formula to find the area of a rectangle is base x height or A = bh.

Area of Parallelograms

1. Find the area of the index card provided.

2. Draw a diagonal line from one vertex on the card to the opposite vertex. Cut your card along that line.

3. Use the two pieces to form a parallelogram that in not a rectangle. What is the area of your parallelogram?

What is the formula for the area of a parallelogram that is not a rectangle?

Area of Parallelograms

Find the area of each figure.1 m

10 cm

2 yd

2 ft

8 ft

7 ft

8 cm

6 cm 2 cm

Area of Circles

Formula for the Circumference of a Circle:2πr or πd

Formula for the Area of a Circle:πr²

Find the area of each figure:

Radius = 2cmDiameter= 2cm

Area of Composed Figures

Find the area of the below figure:

2 in

6 in

4 in

4 in

Wrapping Up

What you should know and be able to do:

• Find the areas of parallelograms.• Apply formulas to solve real-world and mathematical problems

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Summary

• In Your Planner:• Homework: Page 524. Problems 1, 2, 4, 5, 8, 9, 11, 18, 25

STAR Testing – Next Wednesday