The area in square feet of a rectangular field is x^2-130x+4200 the width, in feet, is x-60

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

I’m really confused and need your assist me with this question i’ve never been taught