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With a ruler and a brain. o_O
OR, (lol), use the Pythagorean theorem, e.g.:
a2+b2=c2
Let A be one leg (short side), B the other leg, and C the hypotenuse (long side).
So if the measurements of the two short sides (a and b) are say, 3 and 4 , then you do:
3*3=9
4*4=16
therefore
9+16=c2
So then, it is: 25=c2
Assuming one already knows basic algebra, take the square root of both sides of the equation to get:
(square root of 25)=(square root of 'c')2
And since the square root of C squared is simply C, we know that C is equal to the square root of 25, which is 5.
Therefore, the missing side (C) is 5 units. Knowing algebra you can use the same equation to find any side (with any given side lengths), but C is the most common in math books.
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depends on the needed measurement and type of triangle.
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