1. the sides of an angle are _____. (1 point) 2. when using three letters to name an angle, the middle letter represents the ____. (1 point) 3. a(n) _____ is a tool used to measure angles. (1 point) 4. angles are measured in units of _____. (1 point) 5. there are _____ methods for naming angles. (1 point)