puzzle

sin 90 =1 i.e.
perpendicular
------------- = 1
hypotenuse

i.e. perpendicular = hypotenuse
Now in a right-angled triangle,
perpendicular^2 + base^2 = hypotenuse^2
or, perpendicular^2 + base^2 = perpendicular^2 [as perpendicular=hypotenuse]
or, base^2 = 0
or, base = 0

i.e. in a right angled triangle, base=0???
Reply...in right angled triangle ,concerned angle should be less than 90.because side infornt of angle is called perpendicular.