In triangle ABC, angle A is 90 degrees. Point D is on side BC such that it is the midpoint of side BC. If the length of side AB is 6 units and the length of side AC is 8 units, what is the length of AD?
To solve this, apply the Pythagorean theorem and properties of a right triangle. Recall that the coordinates of the midpoints can also provide insights based on trigonometric relationships.