Explanation:
Here is where to start
Remember for RIGHT triangles:
S-O-H-C-A-H-T-O-A ???
First one Sin Φ = Opposite/Hypotenuse = 20 /29
Φ = arcsin (20/29)
Second One tan Φ = 12/15
Φ = arctan(12/15)
Last one cos Φ = 377/512
Can you finish these with these heavy hints?