
Concept explainers
Solve the following exercises based on Principles 18 through 21, although an exercise may require the application of two or more of any of the principles. Where necessary, round linear answers in inches to 3 decimal places and millimeters to 2 decimal places. Round angular answers in decimal degrees to 2 decimal places and degrees and minutes to the nearest minute.
a. If ∠ 1 = 67°00' and ∠ 2 =93°00', find:
(1)
(2)
b.If ∠ 1 = 75°00' and ∠ 2 =85°00', find:
(1)
(2)

(a)
The value of arc
Answer to Problem 26A
The values of arcs AB and DE are
Explanation of Solution
Given information:
The value of angle 1 is
The value of angle 2 is
The given figure is
Calculation:
The angles GHF and angle 1 are opposite angles. Thus,
Similarly, the angles EGM and angle FGH are opposite angles.
In triangle FGH, the angle GFH comes out to be
Now, an inscribed angle is one half the value of intercepted arc by the angle itself.
The line PMB is a straight line so,
Now, in triangle PMG, the sum of all angles should be equal to 180o.
Now, the value of arc DE can be found from the following formula,
The values of arcs AB and DE are
Conclusion:
Thus, the values of arcs AB and DE are

(b)
The value of arc
Answer to Problem 26A
The values of arcs AB and DE are
Explanation of Solution
Given information:
The value of angle 1 is
The value of angle 2 is
The given figure is
Calculation:
The angles GHF and angle 1 are opposite angles. Thus,
Similarly, the angles EGM and angle FGH are opposite angles.
In triangle FGH, the angle GFH comes out to be
Now, an inscribed angle is one half the value of intercepted arc by the angle itself.
The line PMB is a straight line so,
Now, in triangle PMG, the sum of all angles should be equal to 180o.
Now, the value of arc DE can be found from the following formula,
The values of arcs AB and DE are
Conclusion:
Thus, the values of arcs AB and DE are
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Chapter 56 Solutions
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