Given a triangle ABC and D is the midpoint of BC. Prove that (a) AD < (AB+AC)/2 (b) AD > (AB+AC-BC)/2
Follow Math Help Forum on Facebook and Google+
Originally Posted by MichaelLight Given a triangle ABC and D is the midpoint of BC. Prove that (a) AD < (AB+AC)/2 (b) AD > (AB+AC-BC)/2 Using vectors this is rather easy. Note that . Use the triangle inequality.
View Tag Cloud