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How to draw equal angles with compasses
Use triangles to connect the original corners with the line segments.

Then draw a ray, and the horizontal line segment is cut as long as the one above.

Then cut the other side of the corner with a compass and draw an arc on the lower line segment.

Cut the line segment you just added, and then draw an arc at the top of the figure below. Intersection point ~ ~ ~

You know ...............................................................................................................................................................................