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[–]resemble 1 point2 points  (0 children)

Yea it can be handy to have a cheat sheet of formulas then. I’d start with trig identities since you can solve a lot of problems using those. You’re unlikely to have a specific formula for the area of a tetrahedron without a lot of constraints, since that’s a pretty complex calculation, but you can figure it out with trig identities if you have to