In the case of a triangle, it depends on what the formula is for: the area, an angle, the length of a side, the radius of an inscribing circle or whatever. And in both cases, the answer depends on what information is available.
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Depends on what formula.
The formula to determine speed is Speed= wavelength*frequency
draw a triangle and make 3 areas in the triangle. on the top is S or Speed. on the bottom left is F or Frequency. and on the bottom right is a bckwards/upside down Y for Wavelength. then S divided by For Y. and F times Y. will get you wavelength and what you need. draw what i just said.
Heron created a formula to find the area of any triangle given three side lengths. It is known as Heron's Formula.
Area of triangle=√(s-a)(s-b)(s-c)