Acute Angle

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An angle that is smaller than 90 degrees. It looks kinda like an arrowhead or a wedge. It is smaller than a right angle (which is exactly 90 degrees). You can  imagine it like a door that is open just a little bit. 

acute angle

 An easy way to remember is to imagine a door that is  slightly open.  It also looks similar to an arrowhead or a wedge. Other familiar shapes are star-like shapes that also use acute angles.

Examples of shapes with an acute angle

Here are some examples of shapes that use acute angles:

Octagram with acute angles
Octagram
Hexagram with acute angles
Hexagram within hexagram
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