
Concept explainers
a.
What is the length of the string in terms of
a.

Answer to Problem 68E
Explanation of Solution
Given information:
At the beginning of this section, you learned that an ellipse can be drawn using two thumbtacks, a string of fixed length (greater than the distance between the two tacks), and a pencil. If the ends of the string are fastened at the tacks and the string is drawn taut with a pencil, then the path traced by the pencil is an ellipse. At the beginning of this section, you learned that an ellipse can be drawn using two thumbtacks, a string of fixed length (greater than the distance between the two tacks), and a pencil. If the ends of the string are fastened at the tacks and the string is drawn taut with a pencil, then the path traced by the pencil is an ellipse.
What is the length of the string in terms of
Calculation:
Consider an ellipse can be drawn using two thumbtacks, a string of fixed length (greater than the distance between the two tacks), and a pencil.
In ellipse given by
Hence, the length of string in terms of
b.
Explain why the path is an ellipse.
b.

Answer to Problem 68E
Explanation of Solution
Given information:
At the beginning of this section, you learned that an ellipse can be drawn using two thumbtacks, a string of fixed length (greater than the distance between the two tacks), and a pencil. If the ends of the string are fastened at the tacks and the string is drawn taut with a pencil, then the path traced by the pencil is an ellipse. At the beginning of this section, you learned that an ellipse can be drawn using two thumbtacks, a string of fixed length (greater than the distance between the two tacks), and a pencil. If the ends of the string are fastened at the tacks and the string is drawn taut with a pencil, then the path traced by the pencil is an ellipse.
Explain why the path is an ellipse.
Calculation:
Consider the sum of distance of any point from the foci is constant.
In ellipse given by
If
Hence, the path is an ellipse.
Chapter 10 Solutions
EBK PRECALCULUS W/LIMITS
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