Please help me with this properties of circles maze. If you can’t see the lower left box is 56 degrees.

What are the triple angle formulas? is it related to double angle identities?

If we draw lines to join each given point to the origin, identify the points whose corresponding line has a slope that is an integer value.

Mike was going to sell all of his stamp collection to buy a video game. after selling half of them he changed his mind. he then bought ten more. how many did he start with if he now has 27?