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To construct the angle bisectors, follow these steps:
1. Draw a point on the lower diagonal beam where it intersects with the base of the truss.
2. Use a compass to draw a circle centered at this point that intersects with both the base and the lower diagonal beam.
3. Label the points where the circle intersects with the lower diagonal beam as point A and B.
4. Use a straightedge to draw a line connecting point A on the lower diagonal beam to the top of the upright (the midpoint of the base).
5. Use a compass to measure the distance from point B to the point where the lower diagonal beam intersects with the base.
6. Draw an arc with this distance centered at point A.
7. Label the point where this arc intersects with the base as point C.
8. Draw a line connecting points B and C.
9. This line is the angle bisector of the angle formed between the base and the lower diagonal beam. Repeat the same steps for the other side of the truss.
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