In geometry a bisection refers to a division into two equal parts, for instance a bisection of an angle will involve constructing a line which divides the angle into two angles of equal size.
A bisection of an angle on the plane ( i.e. a angle drawn on a 2 dimensional surface) can be performed using only a straight edge and a pair of compass.
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A bisected angle.
20 degrees.
Bisected means that it cuts the angle into two equal parts. Therefore, if a 40degree angle is bisected, two 20degree angles will be formed.
That one. there!
45 degrees