Question

Using the technique in the model above, find the missing segments in this 30°-60°-90° right triangle.

Answer 1

For this case what you should do is use the following trigonometric relationship:
 sin (x) = C.O / h
 Where
 x: angle
 C.O: opposite leg
 h: hypotenuse
 Substituting the values we have:
 sen (60) = CD / BC
 sen (60) = CD / 4
 CD = 4 * sin (60)
 CD = 3.46
 Answer: 
 CD = 3.46