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Use trigonometry... draw a triangle AOD(with the perpendicular) and find the length of all sides. You have vectors AO, OD and can find AD. Find the magnitude of these vectors(they will be the lengths of the sides of the triangle). Now find an angle AOD or ADO and use the angle to find the perpendicular's distance using basic trig.Anyone part 3 with solution?

Check my diagram to understand this.