if it is a regular shape, a box, prism, pyramid, cone, sphere, use a math formula.
irregular shapes, use water displacement.
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A triangle is a two-dimensional object and so its volume must be 0.
Well, honey, to find the length, width, and height with the volume, you'll need to know the formula for the shape you're dealing with. For a rectangular prism, you can use the formula V = lwh, where V is the volume, l is the length, w is the width, and h is the height. Just plug in the volume and two of the dimensions, then solve for the third. Easy peasy lemon squeezy!
You can't. Volume is only for 3 dimensional shapes. You won't find a way of using volume in any kind of 2 dimensional stuff.
You have to know two out of three ... mass, volume, density ... then you can find the missing one. If density is missing . . . Density = (mass)/(volume) If mass is missing . . . Mass = (density) x (volume) If volume is missing . . . Volume = (mass)/(density)
If you are trying to find the ratio of the lengths of two similar rectangles, divide the length of one side of one rectangle by the corresponding side length of the other rectangle. To find the ratio between their volumes, divide the volume of one rectangle by the volume the other rectangle. To find volume, multiply the width of the rectangle by the length of the rectangle.