Which planet is the largest among the terrestrial planets?

The largest among the terrestrial planets is Venus. Terrestrial planets are generally characterized by their rocky composition, and they include Mercury, Venus, Earth, and Mars. Among these, Venus has a diameter of about 12,104 kilometers, making it the largest terrestrial planet. Earth is slightly larger in terms of volume, but if we are strictly considering diameter, Venus is the largest.

Each of the other planets has smaller diameters: Mercury is the smallest terrestrial planet at about 4,880 kilometers, Mars has a diameter of approximately 6,779 kilometers, and Earth, while larger than Mars and Mercury, has a diameter of about 12,742 kilometers. Thus, while Earth is indeed larger in terms of overall volume and mass, Venus holds the title for the largest diameter among the terrestrial planets, emphasizing the nuances in how planetary sizes can be compared.