Answer Happy

Please explain how to solve, thank you!
In Problems 6-10, let R be the region bounded by the semicircle x = ₁ √4-y² and the y-axis. Each problem will describe the cross sections of a solid that are perpendicular to the y-axis. Write an integral expression that can be used to find the volume of the solid (do not evaluate). 6) The cross sections are squares with one edge in R. 7) The cross sections are circles with the diameter in R. 8) The cross sections are isosceles right triangles with one leg in R. 9) The cross sections are squares with the diagonal in R. 10) The cross sections are quarter circles with the radius in R.