2 1/2 per week hector exercises about the same number of hours each week. During a 4 week period, he exercises 11 1/2. how many hours per week does hector exercise

Consider the figure shown below.
The three legs of the tripod meet the ground at points A, B, and C.

The ground is a horizontal plane, so the points A, B, C when joined together define a triangle.
By design, the weight of the tripod passes through the point O, the center of the triangle, so that triangle ABC is a regular or equilateral triangle.

An equilateral triangle.