Venus and earth
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A caliper that measures inside cylinders and similar things.
Similar - They're both metals, and they both can be recycled. Differences - density, electronegativity, orbital structure, atomic number, heat capacitance, conductance, monetary value, sheen...almost everything else.
the same number of sides and internal angles but not the length of the sides.
Density is a measure of mass per unit volume. You need the mass and the volume of an object to be bale to calculate its density. There is no information about the mass. Furthermore, density is given in terms of grams per cubic centimetre, or grams per millilitre or similar. Density cannot be expressed in gram or cm.
A chloroplast.