The distance formula can be calculated using one of the following 2 formulas: one if you know the value for the speed "s" and time "t", another if you know the two points in the plane.
If you know the speed and time calculate the distance using the following formula:
$$d = s * t$$
$$s = "Speed Value"$$
$$t = "Time Value"$$
$$d = "Distance Value"$$
If you know the value of the two points in the plane, you can calculate the distance using the following formula:
$$d = sqrt((x2-x1)^ + (y2-y1)^)$$
$$(x1, y1) = "first point coordinate"$$
$$(x2, y2) = "second point coordinate"$$
$$d = "distance value"$$
It is an equality which has at least one unknown value that must be cleared,
these unknowns values are represented by letters.
It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".
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