There is no universal formula for volume: it depends on the shape. There are formulae for the volumes of some shapes such as cuboids (including cubes), cones, ellipsoids (including spheres), regular polyhedra (including pyramids), prisms (including cylinders). But there are many more irregular shapes for which no formulae exist.
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The volume of a rectangle (or any other 2D object) is always zero. An object needs to be 3D to have volume.
Use the volume fomula L*W*H
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First way: Ruler and Fomula (L*W*H)Second way: Water displacement with graduated cyclinderThird way: Water displacement with overflow can
First way: Ruler and Fomula (L*W*H)Second way: What_are_3_different_ways_to_find_volumedisplacement with graduated cyclinderThird way: Water displacement with overflow canRead more: What_are_3_different_ways_to_find_volume