Which is Which?
Angles less than 90 degrees are... Acute
Angles between 90 and 180 are... Obtuse
Angles between 180 and 360 are...
Reflex
How to remember?
Alphabet! AOR. Fortunately, the angles are in alphabetical order.
A - Acute - up to 90
O - Obtuse - between 90 and 180
R - Reflex - between 180 and 360
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