Step 1. Draw a line segment to a desired length[br]Step 2. Insert a midpoint in the line segment[br]Step 3. Insert a point between the midpoint and the end of the segment[br]Step 4. Reflect the point[br]Step 5. Label each point[br]Beginning of segment(A), End of segment(B), midpoint(C), point between midpoint and end(D), reflected point(Dprime)[br]Step 6. Take compass and place on D to A[br]Step 7. Take compass and place on Dprime to B[br]Step 8. Label points where circles intersect top(E), bottom(F)[br]Step 9. Draw a segment for point E to F[br]Step 10. Measure angle ECA