1. 11.3 Perimeter and Area of Similar Figures

2. Two rectangles are similar. One has width 4 in. and length 6 in. The other has width of 6 in. and length of 9 in. What is the scale factor of the similar rectangles? What is the ratio of their perimeters? What is the ratio of their areas?

5. Example: A small flat screen TV is 24 in. wide and 18 in. long. A larger TV is similar to the smaller one. The area of the larger screen is 675 square inches. Find the width of the larger TV.

6. Example: The Pentagon in Washington, D.C., is a regular pentagon. Each side of the base is about 900 ft. and the area is about 1,400,000 square feet. You have a scale model of the Pentagon for which the perimeter of the base is 30 yd. Find the area of the base of the model to the nearest square foot.

7. Example: The ratio of the areas of two regular decagons is 20:36. What is the ratio of their corresponding side lengths in simplest radical form?

8. Homework: p.740, #3,4, 5-13odd, 16, 27