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Mongoloid is a term for certain asians. They share outward traits like epicanthic folds and fattier cheekbones for example. This caused people in the west to associate it with down-syndrome. After a while people realized the unfortunate implication and renamed the medical term âdown-syndromeâ instead.
A cycloid is the curve defined by the path of a point on the edge of a circular wheel as the wheel rolls along a straight line. It was named by Galileo in 1599 (http://en.wikipedia.org/wiki/Cycloid). A hypocycloid is a curve generated by the trace of a fixed point on a small circle that rolls within a larger circle.It is comparable to the cycloid, but instead of the circle rolling along a line, it rolls within a circle. Use Google to find a wonderful book of Eli Maor, Trigonometric Delights (Princeton, New Jersey).ence, let us find the parametric equations of the hypocycloid. A point on a circle of radius r rolls on the inside of a fixed circle of radius R. Let C be the center of the rolling circle, and P a point on the moving circle.