question archive A house builder is installing a picture window that is topped with an arch in the shape of a semi-ellipse
Subject:MathPrice:2.87 Bought7
A house builder is installing a picture window that is topped with an arch in the shape of a semi-ellipse. The width is 7 feet, and the height is 3 feet. To help sketch the arch above the window, the builder uses a string attached to two thumbtacks. Approximately where (how far from the center) should the thumbtacks be placed? (Hint: it's asking you to find the foci).
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