hi,

i need to prove that the triangle with vertices (-2,8), (3,20) and (11,8) is isoceles. Find its area.

now for this question would i just need to draw it on a graph and dop;

BxH/2

13x12=156/2=78

if this is correct so far im unsure what to do after this point to find that it is isoceles.

help is required please!

thanks!