Spread your fingers as much as possible, and put your palm on a surface, the angle of which you want to measure. The little finger should lie on the bottom side: it means 0°. The angle between the thumb and the little finger will be 90°, the angles between the little finger and other fingers are, respectively, 30°, 45°, and 60°.
#7 = okay. My children will get tattoos on their fingers; the counts from 6 to 10, haha. Or better: all 25 possible results (6..10 * 6..10) on the back-side of the hand.
#10 = false: I have a 110-degrees-hand. My third finger is not 45, it is 30.