Firstly let me know if you are aware of the definition of an angle? I am going to just brief you with it. An angle is formed by two rays sharing a common end point. Now coming to acute angle, look at the definition of it below.
Acute Angle:
An acute angle is any angle whose measure is less than 90 degree.
The above mentioned diagram gives you the a clear definition of an acute angle. Lets work on exterior angles but you need to wait for it.
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