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!
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Use the formula 1/2 the base * the height
hypotenuse
That is it. Just the hypotenuse - provided you have the correct triangle.
right triangle
The formula for the area of a triangle is A= o.5 x h x w, or if you like to use fractions, A= 1/2 x h x w.