for number 2, "309 – 60°- 900 triangle"? you sure about that?
anyways here's what i found from googling
"If you know one side of a 30-60-90 triangle, you can find the other two by using shortcuts. Here are the three situations you come across when doing these calculations:
Type 1: You know the short leg (the side across from the 30-degree angl......
