It is an obtuse angle because it is greater than 90 but less than 180 degrees
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Ah, a 172 degree angle is called a "reflex angle." It's like when a tree branch bends back a little before continuing to grow. Every angle has its own unique beauty, just like every tree in a forest.
360/(180-172)=45The 360 and the 180 are the same every time.
If one interior angle measures 172° then the corresponding exterior angle measures 180 - 172 = 8°. The number of sides = 360 ÷ 8 = 45.
If you mean a regular polygon with each interior angle being 172 degrees then it will have 45 sides or a 45-agon
An angle of 6 degrees is an acute angle