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they are all the same length
You cannot. The missing side can have any value greater than 0 and less than the sum of the five known sides - and there is no way to know which.
The formula for volume is side cubed, and the formula for a square's area is side squared, so you find the cube root of the volume and square your answer to find area.
Do you know how to find the area of a circle when you know the radius ? Good! Do that. Do you know how to find the area of a square when you know the length of the side ? Good! Do that. Now you have two numbers ... the area of the circle and the area of the square. The problem wants you to find the difference of these two numbers. Do you know how to use subtraction to find the difference of two numbers ? Good! Do that.
Here's a sneaky way to do it, based on an ancient secret of wisdomfrom the Himalayan caves of Nepal and Tibet:If you're sure it's a square, and you know the length of any side,then the missing side has the same length as the one you know !