180o. It's called a straight angle.
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yes a straight angle is a 180 degree angle and a line is just a straight line
No, a right angle is 90 degrees. In fact it is exactly half of a line.
180 degrees
Yes a straight line is considered an angle as the line which is inclined on the base line has 0degree angle on the base line .
This is also known as Eculidean construction. The definition for an angle bisector is: A line which cuts an angle into two equal halves