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A wheel of 56 mm diameter rolls downwards on a vertical wall for half revolution and then on the horizontal floor for another half revolution.

A wheel of 56 mm diameter rolls downwards on a vertical wall for half revolution and then on the horizontal floor for another half revolution. Draw the locus of a point ā€˜Pā€™ on the circumference of the wheel, the initial position of which is the contact point with the wall. Name the curve.

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