6.2 Right-Triangle Applications 439 18. 19. 20. 21. 22. Show that the perimeter of the pentagon in Example 6 is 20 sin 36°. Hint: In Figure 5, draw a perpendicular from O to AB. 23. In triangle OAB, lengths OA = OB = 6 in. and LAOB = 72°. Find AB. Hint: Draw a perpendicular from O to AB. Round the answer to one decimal place. 24. The radius of the circle in the following figure is 1 unit.

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Number 18. Find the area of the shaded region and the radius is 1

6.2 Right-Triangle Applications
439
18.
19.
20.
21.
22. Show that the perimeter of the pentagon in Example 6 is
20 sin 36°. Hint: In Figure 5, draw a perpendicular from
O to AB.
23. In triangle OAB, lengths OA = OB = 6 in. and LAOB = 72°.
Find AB. Hint: Draw a perpendicular from O to AB.
Round the answer to one decimal place.
24. The radius of the circle in the following figure is 1 unit.
Transcribed Image Text:6.2 Right-Triangle Applications 439 18. 19. 20. 21. 22. Show that the perimeter of the pentagon in Example 6 is 20 sin 36°. Hint: In Figure 5, draw a perpendicular from O to AB. 23. In triangle OAB, lengths OA = OB = 6 in. and LAOB = 72°. Find AB. Hint: Draw a perpendicular from O to AB. Round the answer to one decimal place. 24. The radius of the circle in the following figure is 1 unit.
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