Formulas to find the side of a triangle — lesson. Mathematics State Board, Class 8.

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Pythagorean Theorem: In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

In the above right triangle

$ABC$ , the legs are

$AB$ and

$BC$ , and the hypotenuse is

$AC$ .

So it can be written as,

$AC² = AB² + BC²$ .

Here

$BC = a, AB = b$ and

$AC = c$ .

Substituting the known values,

$c² = a² + b²$ .

Did you find an error?

7. Formulas to find the side of a triangle