Posted by lan on .
A right triangle has sides of length 5, 12 and 13. What is the sine of the angle opposite the hypotenuse?
(A) 1 (B) 5/12 (C) 5/13 (D) 12/13 (E) None of the above.

trig 
Reiny,
Mmmmh, aren't they asking for sin 90° ?