I don't really get what you are asking for. Can you clarify it?
Answer:
65 because 12 plus 9 is 21 then 3 times 21 is 65
The fabric costs $8.95 per yard
To answer this question, you would need a protractor, which is a device that measures angle. Because this is a picture, I cannot help you. I'm sorry....
What I can tell you is that the angle is less than 90 degrees.