Point P is in the interior of ∠AOB. Point Q is in the exterior of ∠AOB. Point A, B and O are on the ∠AOB. |
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Acute angle | An angle lies between 00 and 900 |
Right angle | Whose measure is exactly 900 |
Obtuse angle | An angle whose measure is greater than 900 and less than 1800 |
Straight angle | Whose measure is exactly 1800 |
Reflex angle | An angle whose measure is greater than 1800 |