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  1. Swing from B with divider set to AB

  2. Divide semi-circle into fifths (through trial and error)

  3. Label second-to-last division C; connect BC

  4. Erect a perpendicular on line segments AB and BC; extend perpendiculars and label intersection P

  5. Set divider to AD and swing a full circle from P

  6. Set divider to AB or BD and mark remaining points on the circle; connect points to complete pentagon