Reflection of the orthocenter about the circumcenter of a triangle/Formula d=cosA-cosBcosC
Center of the incircle/created by the intersection of angle bisectors
Intersecting point of the three altitudes of a triangle
Intersecting point of a triangle's three medians
Polygon with 3 sides and angles adding to 180
Radius of the largest circle that will fit inside a regular polygon
Circle constructed by connecting the midpoints of the sides, the foot of each altitude, & midpoint of the line segment from each vertex of the triangle to the orthocenter
Description
Term
Line segment that cuts a side into two equal parts at a right angle
Line segment from a vertex of a triangle to the midpoint of the opposite side
Point in the figure that is the center of the circumscribed circle
Various lines drawn from a vertex of a triangle to the opposite side pass through this common point
Perpendicular distance from one side (called the base) to the opposite vertex
Line that cuts an angle into two equal parts
Line on which the orthocenter, centroid, circumcenter, de Longchamps point, nine-point center, and number of other important triangle centers lie
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