Q&A for How to Name an Angle

No, you wouldn't even have an angle in that case. You have to be able to define two intersecting rays before you have an angle, and it always takes at least two points to define a ray. So you'd need a minimum of three points to make an angle.

In geometry a degree is defined as one-360th of the central angle of a full circle.

A angle of exactly 90 degrees is a right angle.

Yes, but it could be confusing, since each angle could also be identified by the number of degrees it contains. Naming with letters could eliminate the confusion.