Find the volume of the solid generated by revolving the region bounded by

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

Which of the following can be used to explain a statement in a geometric proof?

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.