Quote: use special right triangles to write each trigonometric ratio as a simplified fraction . sin 30
a 30/60/90 triangle has legs
1/2a opposite the 30 (the short leg)
sqrt(3)(1/2a) opposite the 60 (the mid leg)
a as the hypotenuse (the long leg)
a is some positive number that represents how big the triangle is
so sin(30) = (1/2a)/a = 1/2
+6251 
