Kite Graphics Calculator tool
The following is the relationship between the related angles and edges:
• Angle ACE = Angle ECD = ½ Angle ACD
• Angle ACO = 90º -½ Angle BAC
• Angle OCE = Angle ACE-ACO
• OE = ½ line BC x tan (OCE)
• AE = OA + OE
• ED = AD -AE
• Line EDF = ½ line BDC
• EF = sin (EDF) x ED