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21. Find the distance PR across the river. P R 45 m 50 m E 75 m C

21. Find the distance PR across the river. P R 45 m 50 m E 75 m C

College Algebra
College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
ChapterP: Prerequisites
Section: Chapter Questions
Problem 5P
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A C 15 cm B D Critical Thinking 19. Are all squares similar? Are all rectangles similar? Explain. Use a drawing in your explanation. R 45 m 20. Figure ABC is a right triangle, and DE is parallel to AB. What is the perimeter of the trapezoid ABED? 0 20 cm 40 cm P 50 m 18. Determine whether the statement is always true, sometimes true, or never true. a. If two angles of one triangle are equal to two angles of a second triangle, then the triangles are similar triangles. b. Two isosceles triangles are similar triangles. c. Two equilateral triangles are similar triangles. d. The ratio of the perimeters of two similar triangles is the same as the ratio of cor- responding sides of the two triangles. E E 75 m A C 8 m + Projects or Group Activities Some distances, such as the distance across a river or the distance to the top of a pole, can be measured indirectly by using similar triangles. 21. Find the distance PR across the river. E B D D -10 22. How can you determine using a mirror placed at and you are 5.5 ft tall, h Unless otherwise
Transcribed Image Text:A C 15 cm B D Critical Thinking 19. Are all squares similar? Are all rectangles similar? Explain. Use a drawing in your explanation. R 45 m 20. Figure ABC is a right triangle, and DE is parallel to AB. What is the perimeter of the trapezoid ABED? 0 20 cm 40 cm P 50 m 18. Determine whether the statement is always true, sometimes true, or never true. a. If two angles of one triangle are equal to two angles of a second triangle, then the triangles are similar triangles. b. Two isosceles triangles are similar triangles. c. Two equilateral triangles are similar triangles. d. The ratio of the perimeters of two similar triangles is the same as the ratio of cor- responding sides of the two triangles. E E 75 m A C 8 m + Projects or Group Activities Some distances, such as the distance across a river or the distance to the top of a pole, can be measured indirectly by using similar triangles. 21. Find the distance PR across the river. E B D D -10 22. How can you determine using a mirror placed at and you are 5.5 ft tall, h Unless otherwise
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