| A | B |
|---|
 | 60 degree angle model |
 | 90 degree angle model |
 | acute angle models |
 | angle models |
 | oblique angle model |
 | obtuse angle models |
| a right angle | 90 degree angle definition |
| angles used in isosceles triangle | 60 degree angle definition |
| an angle less than 90 degrees | acute angle definition |
| an angle between 90--180 degrees | obtuse angle definition |
| an angle more than 180 degrees | reflex angle definition |
| an angle that is NOT 90 degrees | oblique angle definition |
