so basically if you want to find the volume of a object you want to remember this formula L x W x H and it stands for Length times Width times Height.
so you would want to multiply 11 since its the length. times 9 since its the width then you get 99 then multiply 99 times 3 since thats the height and you get 297.
9x9=81 so there is 9 on 2 sides, which is 18 when it gets added together. DONT FORGET ABOUT THE OTHER 2 SIDES!! you have four sides of the square so 9x4=36. I believe the answer is actually 36