Density is defined as the mass divided by the volume. This definition can, in many cases, also be used to measure the density.
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Vol = 0 That is because a square is a 2-dimensional object and 2-d objects do not have a volume.
A trapezoid is a two-dimensional object. 2d objects do not have volume. To calculate the area, see below. With the parallel sides as base1 and base2, and the distance between them as the height: height*(base1+base2)/2
They can have similar shape, similar size and even similar identity (say, wood) and still be of vastly different density. Consider a block of Balsa wood the size of the book "Gone With the Wind". Weigh it. Now consider a block of Sugar Maple or Hickory exactly the same size. Weigh it. It will be muchheavier than the Balsa. The difference is the density.
What objects have a hexagon shape?
True. Points are geometric objects with no dimensions.