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Transparency 8

2. Splash Screen

3. Find the perimeters and areas of figures
Objective
Find the perimeters and areas of figures
Example 8-3c

4. The distance around a geometric figure
Vocabulary
Perimeter
The distance around a geometric figure
Example 8-3c

5. An equation that shows a relationship among quantities
Vocabulary
Formula
An equation that shows a relationship among quantities
Perimeter of Rectangle = 2L + 2W
Area of Square = S2
Area of Rectangle = L  W
Example 8-3c

6. The measure of the surface enclosed by a figure
Vocabulary
Area
The measure of the surface enclosed by a figure
Example 8-3c

7. Example 1 Find the Perimeter of a Rectangle
Example 2 Find the Perimeter of an Irregular Figure
Example 3 Find the Area of a Rectangle
Lesson 8 Contents

8. Find the perimeter of the figure.
Write formula for perimeter of rectangle
Replace L with 18
Replace W with 2
Follow order of operations
Answer:
P E MD AS
feet
Do both multiplication first
Add
Add dimensional analysis
1/3
Example 8-1a

9. Find the perimeter of the figure.
Answer: p = 46 in.
1/3
Example 8-1b

10. Find the perimeter of the figure.
Remember: Perimeter is adding all the sides together
Write problem using addition
Answer:
Start at one point and work around the figure
P =
inches
Add
Add dimensional analysis
2/3
Example 8-2a

11. Find the perimeter of the figure.
Answer: P = 10 ft
2/3
Example 8-2c

12. Find the area of the surface of the reservoir shown below.
Write formula for area of a rectangle
Answer:
Replace L with 4
A =
miles2
Replace W with
Multiply
Add dimensional analysis
3/3
Example 8-3a

13. *
PAINTING Sue is painting a wall that measures feet long and 8 feet high. Find the area of the surface Sue will be painting.
Answer: A = 146 ft2
3/3
Example 8-3c

14. Geometry: Perimeter and Area
Assignment
Lesson 6:8
Geometry: Perimeter and Area
All
End of Lesson 8