How to create a realistic, Earth-like exoplanet?

I am calculating the density of a planet with 1.8 Earth masses and 0.9 Earth radii, but last I checked, the calculations gave me 0.59 g/cm³, but I checked with the not-so astronomical masses, and then I had 3.21 g/cm³.

Now, that is the only thing I could solve but.....how do I calculate circumference?

If you could also review my math and let me know if it is accurate, I feel like I am doing something wrong.

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How to create a realistic, Earth-like exoplanet?

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