Here is an easy method,Originally Posted byLuckyjoshua

Since,

,

means that,

Thus, the sine of an angle in the triangle is 8/17 whenever its opposite side is 8 and hypotenuse 17, that means the remaing side is

Now use the definitions of the six trigonomteric functions and you get,Code:/| / | 17 8 / | / | / | *-----* 15