If l,m,n are the distances of vertices of a triangle from the corresponding points of contact with the incircle, then prove that lmn/(l+m+n)=r^2
(r is inradius)
If a line segment joins the midpoints of two of the sides of a triangle then it is parallel to the third side? This has to do with isosceles triangles and coordinate proofs
triangle KLM has vertices K(1, –4), L(–3, 3), and M(–5, –1). is translated so that K’ is located at point (–3, 2). State the coordinates of L’ and M’, where triangle K'L'M' is the translation of triangle KLM.