the plane x + y + z = 1 cuts the cylinder x 2 + y 2 = 1 in an ellipse. find the points on the ellipse that lie closest to and farthest from the origin.
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perimeter is a path that surrounds a two-dimensional shape. The word comes from the Greek peri (around) and meter (measure). The perimeter can be used to calculate the length of fence required to surround a yard or garden. For rectangles or kites which have only two different side lengths, say x and y, the perimeter is equal to 2x + 2y
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