The circle was believed to be the appropriate shape for an orbit because the earth was known to be round. True or False

False.

A major factor in the belief planetary orbits were based on circles was the Ancient Greek idea of circles as being "perfect" shapes, and the belief the Universe should be "perfect".

Answer: False

Explanation: Circular orbits were introduced by the heliocentric theory.

Were the circular orbits are introduced by the "perfection" of the shape, and because by the observations the scientifics of the time knowed that the orbits were circle like, so assuming that the orbits were perfect circles had sense, so the fact that the earth was round has nothing to se with this.