31,200 round to the nearest ten thousand

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.

Triangle knm is what is true about the sides of knm

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.