10-4 Perimeters and Areas of similar Figures

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Presentation transcript:

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.

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 

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

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

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

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

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

ASSIGNMENT 10-4 p.638-640 #10-46 even Be sure to RATE your understanding of the lesson 4-3-2-1-0 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.