In △ ABC, ab = AC = 10, BC = 16, find the value of tanb

In △ ABC, ab = AC = 10, BC = 16, find the value of tanb

As shown in the figure, in isosceles △ ABC, ab = AC = 10, BC = 16, through a as ad ⊥ BC in D, then BD = 8, in RT △ abd, ab = 10, BD = 8, then ad = ab2-bd2 = 102-82 = 6, so tanb = adbd = 68 = 34