For the given right triangle the longer leg is 7 units long
     For the given right triangle, the longer leg is 7 units long and the shorter leg is 3 units long.  sin alpha =  (Type an integer or a simplified fraction. Type an exact answer, using radicals as needed.)   
  
  Solution
Sin(alpha) = length of medium leg / length of longest leg
Sin(alpha) = (sqrt(7^2-3^2)/7
Sin(alpha) = sqrt(40)/7

