Answer:
P(Px, Py) and Q(Qx, Qy)
Midpoint
M((Px + Qx)/2, (Py + Qy)/2)
Distance
d = √((Px - Qx)^2 + (Py - Qy)^2)
For example
(A)
M((-5 + 3)/2, (2 + (-4))/2) = M(-1, -1)
d = √((-5 - 3)^2 + (2 - (-4))^2) = √(64 + 36) = 10
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