Question 1003293
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Find the coordinates of the centroid of the triangle with the given vertices:
A(-3,15), B(1,5), C(5,10).
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{{{X[centr]}}} = {{{(x[a] + x[b] + x[c])/3}}},


{{{Y[centr]}}} = {{{(y[a] + y[b] + y[c])/3}}}.