
To find: the length of diagonal

Answer to Problem 22WE
The length of diagonal
Explanation of Solution
Given Information:
Points
Calculation:
Consider the figure,
Three useful trigonometric ratios, given below in abbreviated form,
In case of diagram, number of sides is 10. Therefore, angle in regular decagon is given by
Apply the sine formula in the right angle triangle for calculating length,
Put the value of angle, to get
Use cross-multiplication, to get
Use, the table of sine of angle provided, the approximate value of
Therefore, the length of diagonal
Chapter 8 Solutions
McDougal Littell Jurgensen Geometry: Student Edition Geometry
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