I assume you mean 15-20.
There are several ways you can get it so I will give you guidelines to make it easier to find the answers using question 15 as an example.
You know one side and an angle and that the triangle has a right angle it.
If you are looking for a side opposite of your known angle and it is not the hypotenuse use: Tan^-1(angle)*known side, after that use pythagorus theorem. You can check if this is the right length by taking the sine of the unknown angle (90-known angle) This will get most of your problems except 18 and 19.
For 18 and 19, I would replace tan with the sin version. For 20, you can either work to have all of the digits on one side of the equation, or you can use the first equation after solving for the missing angle. I will double check my math when I am by a pad of paper to work it out, if you can reply with answers, I can compare to make sure they are right.
