PLEASE HELP 35 POINTS
Find the value of x in the triangle shown below.

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

Which of the following is the shape of a cross section of the figure shown below