In Problems 11-15. let R be the region bounded by the lines 3: = 4 I, I = 2, and the x-axis. Each problem 'will describe the cross sections of a solid. Find the 1irqume of that solid {you d_o evaluate these problems]. 1 1] The cross sections are squares perpendicular to the x-axis with one edge in R. 12] The cross sections are semicircles perpendicular to the jar-axis with the diameter in R. 13] The cross sections are equilateral triangles perpendicular to the x-axis with one edge in R. 14] The cross sections are squares perpendicular to the y-axis with the diagonal in R. l