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akhilbabu1
ACUTE ANGLE.
this is because the angle is less than 90 degree and greater than 0 degree

MathGeek289
This Is An Acute Angle. 
You Know This Because:
Acute Angles Are Angles That Measure Less Than 90 Degrees. 
A Right Angle Is An Angle That Measures Exactly 90 Degrees
An Obtuse Measures More Than 90.

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