The distance is quite simple because you take your points and you take the square root of all the points (x2-x1)^2+(y2-y1)^2 and so on. You the. Take the square root of the entire equation. That easy kinda of the same with midpoint. Here are the two formulas.
Pretty simple now into spheres. The equation is simple if all points are known. The center is (h,k,j)
You then put it into the formula (x-h)^2+(y-k)^2+(z-j)^2=r^2. That is it. Just plug you points and find the answer. Simple
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