2. 10-4 Perimeters and Areas of similar Figures
To find the perimeters and areas of similar figures
With knowledge of computing area, students will discern that both the ratio of perimeters and the ratio of areas of similar geometric figures are related to the scale factor.

12. 10-4 Quiz
The following questions are designed to help you determine how well you understood today’s lesson. Please take time to ask questions if you miss one and don’t know why! Record the number you get right on your portfolio sheet 

13. 1. The figures are similar
1. The figures are similar. Give the ratio of the perimeters and the ratio of the areas of the first figure to the second. The figures are not drawn to scale.
Non-Response Grid

14. 8:7 and 64:49 9:8 and 64:49 9:8 and 81:64 8:7 and 81:64
2. The widths of two similar rectangles are 16 cm and 14 cm. What is the ratio of the perimeters? Of the areas?
8:7 and 64:49
9:8 and 64:49
9:8 and 81:64
8:7 and 81:64
Non-Response Grid

15. 3. Two trapezoids have areas 432 cm2 and 48 cm2
3. Two trapezoids have areas 432 cm2 and 48 cm2. Find their ratio of similarity.
1:3
9:1
3:1
1:9
Non-Response Grid

16. 4. The figures are similar. The area of one figure is given
4. The figures are similar. The area of one figure is given. Find the area of the other figure to the nearest whole number. The Area of the smaller Trapezoid is 558 cm2.
576 m2
3147 m2
3249 m2
14 m2
Non-Response Grid

17. 5. A rectangular napkin costs $3. 25
5. A rectangular napkin costs $3.25. A similar tablecloth is five times longer and five times wider. How much would you expect to pay for the tablecloth?
$81.25
$48.75
$16.25
$32.50
Non-Response Grid

18. ASSIGNMENT
10-4 p #10-46 even
Be sure to RATE your understanding of the lesson after you finish it AND give me one complete sentence as to why you rated yourself that way then summarize what the lesson was about in a sentence or two.