Midpoint of AC = [ (5 + 0) / 2 , (-1 + 00 / 2 ] = [5/2, -1/2] = L
Midpoint of BC = [ ( 2 + 5) / 2 , (-1 + 2) / 2 ] = [7/2, 1/2] = M
Slope of AB = [2 - 0] / [ 2 - 0] = 2/2 = 1
Slope of LM = [ -1/2 - 1/2] / [ 5/2 - 7/2] = [-1] / [ - 2/2] = -1 / 1 = 1
So....LM is parallel to AB
And the length of AB = sqrt(8) = 2sqrt(2)
And the length of LM = sqrt [ 7/2 - 5/2)^2 + ( 1/2 + 1/2)^2 ] = sqrt [ 1^2 + 1^2] = = sqrt(2) = (1/2)2sqrt(2)