SOLUTION: If you have a cyndrical object that is 36 inches across with a radius of 18 inches and is 1 inch thick, what is the cubic inches of that object? I thought it was 36/2 which is 18.

Algebra ->  Volume -> SOLUTION: If you have a cyndrical object that is 36 inches across with a radius of 18 inches and is 1 inch thick, what is the cubic inches of that object? I thought it was 36/2 which is 18.       Log On


   

Question 893677: If you have a cyndrical object that is 36 inches across with a radius of 18 inches and is 1 inch thick, what is the cubic inches of that object? I thought it was 36/2 which is 18. Then 18x18/ which is 324, then 324xpi(3.14) and then 1017.36x the width which comes up with your cubic inches but if its 1 inch thick it would remain the same value. Am I doing something wrong?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Your description is not too precise. You seem to be saying, diameter accross the circular cross section is 36 inches, and distance from top circular surface to the bottom circular surface is 1 inch.

h=1
d=36
r=d%2F2
formula for volume: highlight_green%28h%2Api%2Ar%5E2%29

To use what seem to be your values,
volume is 1%2Api%2A%2836%2F2%29%5E2,
pi%2A%2818%29%5E2
highlight%28324%2Api%29 cubic inches.

Multiplication by 1 should not cause confusion; just be sure you are keeping within the same measurement unit or properly converting whenever needed. Your example seems to be all in inches.