Calculate the Tangent of Angle A in Right Triangle

Consider a triangle $ABC$ where angle $C$ is $90^ ext{o}$. The lengths of sides $a = BC$ and $b = AC$ are given by $a = 8$ and $b = 6$. Let angle $A$ be represented by $ heta$. Find the value of $ an heta$.

Recall that in a right triangle, the tangent of an angle is defined as the ratio of the length of the opposite side to the length of the adjacent side.