Geometry Formulas Triangles

The sum of the angles of a triangle: Always, always, ALWAYS! The Pythagorean Theorem: This formula is for right triangles only! The sides, a and b, of a right triangle are called the legs, and the side that is opposite to the right (90


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The Geometry of Triangles


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Properties of Triangle

Therefore, Heron’s formula is used to calculate the area of a triangle, if all the sides lengths are known. First, we need to calculate the semi perimeter (s). s = (a+b+c)/2 , (where a,b,c are the three sides of a triangle) Now Area is given by;

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