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Depending on what you're solving for in a triangle determines which formula you're going to use. The equations (formulas) are as follows:

Finding a missing side of a Right Triangle: a2 + b2 = c2

a = leg1 or side1

b = leg2 or side2

c = Hypotenuse

Interior Angles of a Triangle: x + y + z = 180º

Perimeter of a Triangle: P = S1 + S2 + S3

Area of a Triangle: A = ½bh OR A = (bh)/2

When finding the area of something your unit of measurement is always going to be squared. Ex: 5 in2

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Q: What is the formula of a triangle as an equation?
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