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Mathematics 110 Online
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The equilateral triangle shown is rotated about line a. Each side of the triangle measures 20 mm. An equilateral triangle is shown. Line of rotation a goes through one point and the midpoint of the opposite side. What shape is created by the rotation and what is the approximate circumference of the base? Circumference of a circle: C = 2πr a cylinder with a circumference of about 63 mm a cylinder with a circumference of about 126 mm a cone with a base circumference of about 63 mm a cone with a base circumference of about 126 mm

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