1 degree = 60 minutes of arc
1/2 o = 60/2 '
= 30'
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One half of a 45-degree angle would be a 22.5-degree angle. This is because when you bisect a 45-degree angle, you are dividing it into two equal parts. Therefore, each half would measure 22.5 degrees.
180 degrees
A 140 degree angle is about half way between a 90 degree angle, which has lines that are perpendicular to each other, and a 180 degree angle, which is a straight line. A 140 degree angle is an obtuse angle which has a line a little over half way between the 90 degree and 180 degree angles.
A 45-degree angle looks like half of a 90-degree angle. It looks exactly like one straight line with one horizontal line of the bottom, similar to half a square.
acute 45 degree angles