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There isn't a specific name for 45 degrees, like when 90 degree angle is called a "right angle".

However, there is a general term for any angle less than 90 degrees - "acute angle".

Here's a full list:

< 90 degrees = acute

90 degrees = right angle

between 90 & 180 degrees = obtuse

180 degrees = straight line

between 180 & 360 degrees = reflex

360 deg = revolution (because it turns in a complete circle)

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14y ago

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