| | Triangle : Isoceles triangle |
 | | A Triangle is one of the basic shapes of geometry: a two-dimensional figure with three vertices and three sides which are straight line segments. |
 | | That is, if the longest side of a triangle is twice that of the longest side of a similar triangle, say, then the shortest side will also be twice that of the shortest side of the other triangle, and the median side will be twice that of the other triangle. |
 | | The three perpendicular bisectors meet in a single point, the triangle's circumcenter; this point is the center of the circumcircle, the circle passing through all three vertices. |
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