Question 1127226
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If AD is 10 and the distance from D to AB is 5, then triangle ABD is a 30-60-90 right triangle, with the 30-degree angle at A.<br>
(My sketch has AB horizontal, with B to the right of A; AD slanting up to the right from A; DB perpendicular to AB.)<br>
Since angle A is 60 degrees, AD bisects it.