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An Elliptical Fireplace Arch

A fireplace arch is to be constructed in the shape of a semi ellipse. The opening is to have a height of 40 inches at the center and a width of 82 inches along the base. To sketch the outline of the fireplace, the contractor uses a 82-inch string tied to two thumbtacks. Where the thumbtacks should be placed.
Answers
1. 21 inches on either side of the center
2. 7 inches on either side of the center
3. 20 inches on either side of the center
4. 9 inches on either side of the center

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