a mathematical relationship or rule expressed in symbols.
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It depends on the context. In physics, and some other sciences, a "formula" is usually an equation used to calculate something.
You would have a difficult time finding a formula to prove that statement, for two main reasons: 1). The statement is false. A triangle is never a rhombus. 2). Formulas can describe things, but they can't 'prove' things.
This formula is called the quadratic formula.
formula of under root
Rearrange the formula so that the indicated variable is the subject of the mathematical formula.
you find the formula... then you calculate it. Its that simple.