CBSE - X - Mathematics - Three Dimensional Geometry
Orthocentre: The three altitudes of a triangle meet in one point called the orthocentre
Incentre:The three angle bisectors of a triangle meet in one point called the incentre.
Centroid: The three medians (the lines drawn from the vertices to the bisectors of the opposite sides) meet in the centroid or center of mass
Circumcentre:The three perpendicular bisectors of the sides of a triangle meet in one point called the circumcenter
Incircle: A circle inscribed in the polygon.
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