Reading with interest Slusarenko et al’s paper [1], we find it necessary to advise the interested and active instructor of physics that figure 2 in the article is misleading, in the sense that for any homogeneous triangle, its centre of mass is located at the intersection of the triangle’s medians (an interesting geometrical non-calculus proof is provided by Polya [2, p 38]). In fact, the dark point (2xCM, 2yCM) corresponding to the centre of mass of the scaled triangle should have been drawn on the common hypotenuse of triangles B and C shown in that figure because that line, joining the vertex O and the midpoint of the corresponding opposite side (hypotenuse) of the scaled triangle, is by definition a median of the scaled plate.