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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
30 Oct 2021

Given information

Note that given,

A bird with these tendencies is released from an island that is 5 km from the nearest point B on a straight shoreline, flies to a point C on the shoreline, and then flies along the shoreline to its nesting area D. Assume that the bird instinctively chooses a path that will minimize its energy expenditure. Points B and D are 13 km apart.

Step-by-step explanation

Step 1.

Draw the required diagram,

Let the distance from to .
Know that Pythagorean Theorem, the sum of the squares on the legs of the right-angled triangle is equal to the square on the side opposite to the right angle triangle. That is:
 

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