The circumference is the length of the outer line of the circle. The formula is
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C = 2πr
C = 2 x 3.14 x 1.5
C = 9.43 km
There are instances of low, rounded and subdued topographic features that sometimes being overlooked in the field and has not been seen or observed that's is why vertical exaggeration is necessary to enhance the measurement of height in models and presentation of terrains.
Hello! We are currently in the Orion Arm of the Milky Way.
I think both options are true!