# Thread: Volume of a solid

1. ## Volume of a solid

Th question is :
Consider the region bounded by y = cos(x), y = 0, x = 0, and x = /4. Rotate the region around the x-axis. Sketch the region. Write an integral giving the volume of the solid. Give your answer using the form below.

What i got was that A=0 B=pi/4 and the integral is pi*cos(x)^2 dx
Im not sure if this is correct can anyone double check me please? thanks

2. Originally Posted by acosta0809
Th question is :
Consider the region bounded by y = cos(x), y = 0, x = 0, and x = /4. Rotate the region around the x-axis. Sketch the region. Write an integral giving the volume of the solid. Give your answer using the form below.

What i got was that A=0 B=pi/4 and the integral is pi*cos(x)^2 dx
Im not sure if this is correct can anyone double check me please? thanks
Looks good to me.

3. Im doing my homework on this web program named web assign and i tried to input the answer as pi*(cos(x))^2 but it keeps saying its wrong, does anyone have experience with this program am i entering it in a format it does not like?

4. Originally Posted by acosta0809
Im doing my homework on this web program named web assign and i tried to input the answer as pi*(cos(x))^2 but it keeps saying its wrong, does anyone have experience with this program am i entering it in a format it does not like?
Perhaps you're meant to evaluate the integral and submit what you get as your answer.