1. Finding the area of a Trapezoid
SWBAT find the area of a trapezoid by decomposing it into two triangles and using the formula.

2. Do Now
1. What is the formula for the area of a rectangle? Provide an example.
2. What is the formula for the area of a parallelogram? Provide an example.
3. What is the formula for the area of a triangle? Provide an example.

3. Vocabulary
-Trapezoid: a 4-sided flat shape with straight sides that has a pair of opposite sides parallel.
- Decomposing: breaking a shape up into two other shapes (Ex: a trapezoid into 2 triangles)
Review:
What does parallel mean?
How do we measure height?

4. Area of a Trapezoid
Draw a diagonal line to break the trapezoid into two triangles.
Find the area of each triangle
Add the area of each triangle together
See the diagram below.
10 in
12 in
5 in

5. click to reveal
Example.
Find the area of the figure 
by drawing a diagonal and splitting it into two 
triangles.
12 cm
10 cm
11 cm
9 cm
12 cm
10 cm
11 cm
9 cm

6. The Area (A) of a trapezoid is also found by using the formula:
Note: The base & height always form a right angle!
10 in
12 in
5 in

7. Find the area of the figures using the formula.
Try These.
Find the area of the figures using the formula.
12 ft 10
8 ft
7 ft
8 ft 7 6 8 13
9 ft
click to reveal
click to reveal

8. Exit Ticket:
Explain in words two methods to find the area of a trapezoid. Include visuals.

9. Who did Ms. Dalton meet this weekend?