Texas Math Models

Try “number line” or “4.5D”

An angle is part of a circle

and a degree is one slice

G4

An angle is the slice of a circle that its two rays cut out.55°the vertex sits at the center of the circle360°180°90°a whole turn, a half turn, a quarter turnone degree is one of 360 equal slicesthat is why a protractor is a half circle with 180 of those slices on it

How this one works

How

picture a circle around the vertex. The angle is the slice the rays cut out.

Best when

you want to know why 360 and 180 keep showing up.

The same problem, other ways