Pythagoras' theorem
Pythagoras' Theorem 
The theorem provides a way of calculating the length of any side of a right-angled triangle if the lengths of the other two sides are known. For example, to find the length of a bridge constructed over a valley 120 m wide, when the vertical drop of the bridge is 20 m:
Using Pythagoras' theorem
The length of the bridge is 121.66 m.
Pythagoras' theorem is also used to determine certain trigonometric identities such as sin2 θ + cos2 θ = 1.
© RM 2009. Helicon Publishing is division of RM.
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