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Transparency 4

2. Splash Screen

3. Find the areas of parallelograms
Objective
Find the areas of parallelograms
Example 4-2c

4. Vocabulary
Base
The side of a parallelogram or trapezoid that is perpendicular to the height
Example 4-2c

5. In a triangle, the distance from a base to the opposite vertex
Vocabulary
Height
The length of the segment perpendicular to the base with endpoints on opposite sides.
In a triangle, the distance from a base to the opposite vertex
Example 4-2c

6. Vocabulary Parallelogram
A quadrilateral with opposite sides parallel and opposite sides congruent
Example 4-2c

7. Example 1 Find the Area of a Parallelogram
Lesson 4 Contents

8. Find the area of the parallelogram.
A = 7.5 cm
 6.4 cm
Write formula for area of parallelogram
Replace b with 7.5 cm
Replace h with 6.4 cm
1/2
Example 4-1a

9. Find the area of the parallelogram.
A = 7.5 cm
 6.4 cm
Multiply numbers
Answer:
A = 48
cm2
Multiply units
1/2
Example 4-1a

10. Find the area of the parallelogram.
Answer: A = 52 in2
1/2
Example 4-1b

11. Find the area of the parallelogram
A = 8 cm
 4.5 cm
Write formula for area of parallelogram
Replace b with 8
Replace h with 4.5
2/2
Example 4-2a

12. Find the area of the parallelogram
A = 8 cm
 4.5 cm
Multiply numbers
Answer:
A = 36
cm2
Multiply units
2/2
Example 4-2a

13. Find the area of the parallelogram to the right.
Answer: A = 10.8 m2
2/2
Example 4-2c

14. Area of Parallelograms
Assignment
Lesson 11:4
Area of Parallelograms
All
End of Lesson 4