What Can You Do With An Arby's Roast Beef Sale?
Showing posts with label wcydwt. Show all posts
Showing posts with label wcydwt. Show all posts
Saturday, February 6, 2010
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The Nine-Point Center
X(5) in Kimberling's Encyclopedia of Triangle Centers, is the center of the nine-point circle, which is the unique circle passing through the midpoints of the sides of the triangle. The radius of the nine-point circle is one-half the circumradius.