(a)
To find: the angle which was acute 100000 years ago and will be obtuse 100000 years from now.
(a)
Answer to Problem 27PPS
The angle is
Explanation of Solution
Given information:
The big dipper may be the best known group of stars in the sky. The figures below show how the big dipper probably looked 100000 years ago, how it looks today, and how it will look 100000 years from now.
Calculation:
Consider the graphs:
Observe the image.
It can see that
(b)
To identify: an angle that appears to be right angle.
(b)
Answer to Problem 27PPS
Explanation of Solution
Calculation:
Consider the graphs:
To identify the angle which appears to be right angles, observe each three consecutive points over all three periods.
Clearly,
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