This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
See diagram.

ABC is a triangle.  AD is the median from A on to BC.  BD = DC.
Area of triangle ABD = 1/2 BD * AE  (altitude.
Area of triangle ADC = 1/2 DC * AE (altitude of triangle ADC also)

  As BD = DC,  the median divides the triangle into two equal parts (areas) ABD and ADC.

Now look at the area of triangle ABD with AD as the base. Area = 1/2 AD * BL
Area of triangle ADC with AD  as the base = 1/2 AD * CM
   Since the areas are equal,  CM = BL

1 5 1
click on thanks blue button above