The answer depends on what information you have from which you wish to calculate time.
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There are many formulae for triangles: Some formulae will calculate sides given angles or conversely. Some will calculate the area. It is not possible to say how you would use a formula without knowing what it is for!
The formula you use depends upon what you are trying to calculate. If you want to multiply two cells (e.g. A1 and C2), the formula would be =A1*C2.
You can use a graph to calculate speed.
Please use the formula: distance = speed x time Replace the variables you know, and then calculate the remaining variable with this formula.
Acceleration = Final velocity - Initial velocity / time