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Concept explainers
(a)
To find: Where should the thumbtacks be placed
(a)
![Check Mark](/static/check-mark.png)
Answer to Problem 52E
The thumbtacks should be 3.71 feet from center
Explanation of Solution
Given information: Construction: The arch of a fireplace is to be constructed in the shape of a semi-ellipse. The opening is to have a height of 3 feet at the center and a width of 8 feet along the base. To sketch the outline of the fireplace, the contractor uses an
8-foot string tied to two thumbtacks.
Calculation:
Creating the equation with
You can find the location of the foci by:
This means the thumbtacks should be 3.71 feet from the center.
(b)
To explain: Why this technique works.
(b)
![Check Mark](/static/check-mark.png)
Explanation of Solution
Given information: Construction: The arch of a fireplace is to be constructed in the shape of a semi-ellipse. The opening is to have a height of 3 feet at the center and a width of 8 feet along the base. To sketch the outline of the fireplace, the contractor uses an
8-foot string tied to two thumbtacks.
Calculation:
This works on the principal of the ellipse.
By placing the thumbtacks 3.71 feet from center using and 8 foot string, will allow to create the elliptical shape desired.
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Advanced Mathematical Concepts: Precalculus with Applications, Student Edition
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