Should be 1/4 to my knowledge.
An acute angle can also be made inside of that type of triangle.
Answer:
38.7°
Step-by-step explanation:
You are basically looking at a triangle with a 90° angle (check picture).
Since we are looking for the ramp's angle and are given the length of the opposite and the hypothenuse, we have to solve the following equation:

which is equivalent to

Mi no espeak math,yo no comprende
7/15 is your answer I am so happy that I could help :)