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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An acute angle
45 degree angle
It is a 90 degree angle, or a right anlge, plus another 45 degrees. So you can visualize it as a 45 degree angle measured from the negative side of the x axis going toward the positive y axis on the x-y plane.
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a 45 degree angle is less than a 90 degree angle and more than a 30 degree angle Its like cutting a round Pizza into 8 equal slices, one of the slices is a 45 degree angle, two slices would be a 90 degree angle. 360 degrees is the circle of the whole pizza. It doesn't matter the size of the circle, or Pizza if its easier, the angles will still be the same.