Distance between the Incenter and the Centroid of a Triangle. Formula in terms of the sides a,b,c.

Distances between the Feuerbach Point and Incenter, Centroid, Nine Point Center and Spieker Center.

Geometry Problem 1388.Triangle 40-60-80 degree, Incenter, Congruence.

Geometry Problem 742. Scalene Triangle, Orthocenter, Centroid, Circumcenter, Circumradius, Midpoint, Distance, Square, Metric Relations.

Geometry Problem 626 Triangle, Distance from the Incenter to an Excenter.

Euler's Theorem: Distance between the Incenter and the Circumcenter. Problem 155.

Distance between the Circumcenter and the Excenter. Problem 157.

Distances between the Circumcenter, Incenter, and the Excenters. Problem 159.

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