A triangle has altitudes. $\left(1/ 2/ 3\right)$

If $\overline{AD}$ is a median of $∆ABC$, then $D$ is the mid-point of _____. ($AB/BC/ AC$)

For the following triangle, does the altitude lie in the exterior of the triangle, if drawn from the marked vertex.

For the following triangle, does the altitude lie in the exterior of the triangle, if drawn from the marked vertex.

For the following triangle, does the altitude lie in the exterior of the triangle, if drawn from the marked vertex.

Find the measure of $\angle A$ from the given figure

Find the unknown angle $x$ from the given figure alongside