Use Pythagoras's equationa^2 + b^2 = c^2
where c is the hypotenuse - the longest side which is opposite the right angle
a and b are the two smaller legs.
So, if the two legs are known and the hypotenuse is unknown:
Suppose the hypotenuse and one side is known, the other is unkown:
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Trigonometry and Pythagoras' theorem
It can be found by: hypotenuse squared minus known side squared = unknown side squared
You begin by finding the length of the unknown side. The square of the hypotenuse is equal to the sum of the squares of the two legs. Then once you have the lengths of all 3 sides, you adum all up, and you have the perimeter.
This side is called the hypotenuse.
to find the missing side of a right triangle you need the pythagorean theorem. A2 + B2 = C2. c is the longest side and a and b is the other sides. no particular side is a or b just the longest side is c.