I went back to my initial three points; actually, I added an intitial 3rd pt and made some triangles. The orange is the first three, green and red are with a 4th pt from the cross product of 1st and 3rd, added to 2nd.
644.8 m. km^2, 14326.4 km in diameter, 429 px across
polygon(200.7px 194.3px, 226.6px 224px, 183.7px 231.6px)
x0: -13.8 px, y0: -20.2 px, z0: 96.2 px
x1: 12.1 px, y1: 9.5 px, z1: 106.1 px
x2: -30.8 px, y2: 17.1 px, z2: 101.3 px
x3: -13.8 px, y3: -20.2 px, z3: 104.4 px
2.88 m. km^2, 0.44%
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