You need the mass (m) and volume (v) of the object. The density (d) is then given by:
d = m / v
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You need its mass and volume.
The shape of an object is not enough to calculate its density. You also need its mass and then Density = Mass/Volume.
Not enough information. To calculate mass, you would need volume and density (mass = volume x density).
Because density expressed in two significant figures depends on your accuracy of your measurements of mass and volume to calculate as well as any variables that you are expected to use.
Density = Mass/Volume so you need to measure the mass of the substance and divide by the volume that it occupies.