Two.
However, you can actually do it with just one. Consider the median AD of triangle ABC. Then the point G, 2/3 of the way from A to D, is the centroid. This process (2/3 of the way from the vertex to the opposite side) can be applied to any median.
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Find the median of each side of the triangle. The centroid is where all three lines meet.
You simply find the midpoint of each side of the triangle, then you draw a line connecting the midpoints to their opposite corners of the triangle. The intersection of these points will occur at the same point: the centroid.
The coordinates of the centroid relate to the average of coordinates of the triangle's vertices. Free online calculation tool - mathopenref.com/coordcentroid.html
Centre of area for plane triangle (no thickness, theory only) Line from apex to middle of opposite side, repeat for another apex, intersection is centre of area. > If triangle has thickness go from centre of area vertically down to half thickness of material. This is the centre of mass or centroid
The centroid is the centre. How you find it depends on what information you have about the hypersphere.