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Discover Questions

A,B,C,D is on a sphere of radius=r (cm).
AB=CD=a, AC=BD=b, AD=BC=c (cm).
1) Express r in terms of a,b & c.
2) Min value of r when 4a+5b+6c=1? What are some science fiction words for faster-than-light travel? Is duality in a photon and electron differ only in charge and mass in a wave? Why do so few people seem to realize that "escape velocity" is relevant only for unpowered objects and vehicles? Does taking two aspirin pills a day help me shorten my life span?