In Prob. 3.23, determine the perpendicular distance from point D to a line drawn through...

In Prob. 3.23, determine the perpendicular distance from point D to a line drawn through points B and C.

Reference of Prob. 3.23:

A 6-ft-long fishing rod AB is securely anchored in the sand of a beach. After a fish takes the bait, the resulting force in the line is 6 lb. Determine the moment about A of the force exerted by the line at B.