I'd caution against memorizing any list of formulas.
That said, there are a few mental things to know -- for example, with triangles -- know the proportions 3-4-5 and 5-12-13. You don't need to memorize a^2 + b^2 = c^2 (pythagoreom formula) - but memorizing those 2 triangle proportions will get you way further than any formula.
Also know the 45-45-90 degrees for a right triangle. As well as the 30-60-90 degrees for a triangle of proportion (x, 2x, and x root 3).
That's pretty much as much
...
That said, there are a few mental things to know -- for example, with triangles -- know the proportions 3-4-5 and 5-12-13. You don't need to memorize a^2 + b^2 = c^2 (pythagoreom formula) - but memorizing those 2 triangle proportions will get you way further than any formula.
Also know the 45-45-90 degrees for a right triangle. As well as the 30-60-90 degrees for a triangle of proportion (x, 2x, and x root 3).
That's pretty much as much
...
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