Question: Medians of Triangle

Could anyone help me on how to find a median of a triangle on maple? the questions is asking for a triangle ABC , write a maple procedure which has vertices A,B, C as input and which has a out of the point P (centroid) and a plot of the triangle with the three medians.
 

then from the triangle ABC, let triangle A1B1C1 be the triangle formed using the midpoints A1,B1,C1 of triangle ABC. use vector methods to show that Triangle A1B1C1 is similar to Triangle ABC. Specifically, use the dot product and vector algebra to show that the corresponding angles are equal: Angle A=Angle A1; Angle B=Angle B1; and Angle C=Angle C1. write a procedure to produce a picture of triangle ABC and Triangle A1,B1,C1.

Please help me. I don't even know where to begin touching this question. Thank You.