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How to bisect a given angle? How to divide it into two equal parts?
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| 1. |
| Start with the given angle.
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| 2. |
| Draw an arc with its center at the angular point, and a suitable radius.
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| 3. |
| Draw an arc with its center at the intersection of arc 2 and one leg of the angle, and a suitable radius (more than "halfway" the angle).
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| 4. |
| Draw an arc with its center at the intersection of arc 2 and the other leg of the angle, and a radius equal to that of arc 3. Arcs 3 and 4 must intersect.
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| 5. |
| Draw a line from the angular point to the intersection of arcs 3 and 4.
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| 6. |
| Line 5 is the bisector of the angle; it divides the angle into two equal parts.
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