The equator divides the earth into two hemispheres, northern and southern. Its latitude is 0 degrees.
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When a line divides another in two equal parts, it is called a bisector. If the bisector happens to cross the other line at right angles, it is called a perpendicular bisector.
One possible way: draw 21 radii, each forming an angle of 17.142857.. degrees with another radius. Another option: the question does not require the 21 parts to be equal. So make twenty cuts where each cut divides a segment into two (equal or unequal) parts.
bisect is to divive into equal parts.
The answer depends on how many equal parts there are.