a right angle, or a 90 degrees angle
-- an angle that measures 90 degrees -- an angle whose sides are mutually perpendicular
an acute angle
180 degree angle.
flatangle (apex) A straight angle.
That's a "central angle", but the part that really fascinates me is this: What would it look like if you hadan angle whose vertex was in the center of the circle and whose sides didn't intersect ? ? ?
A 180 Degree angle therefore a straight line.
An inscribed angle is an angle whose vertex is on the circle and whose sides are chords.
central angle
Inscribed angle
The measure of an angle whose sides overlap is 0 degrees. It is than not an angle, but rather a line.
An inscribed angle.
A single ray.