MPM2D Centroid and Circumcentre – 2015-10-22

Draw a triangle (using a ruler!) on a piece of cardboard. Cut it out. Find the centroid (intersection of medians). Balance the triangle on the point of a pencil.

On the same triangle’s reverse side, find the circumcentre (the intersection of the perpendicular bisectors). Remember that the circumcentre may not be on the triangle itself; it could be outside the triangle. In that case, just draw the perpendicular bisectors.


I made these diagrams using GeoGebra. It’s great.


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