An introduction to exoplanets
2.5 Circles, radii and area
Astronomers use maths to interpret the light they collect. One very useful bit of maths for astronomy is the area of a circle. Astronomy features spherical objects like stars and planets and you have already seen that when we view them we see their cross-section as a circle. In the next section you’ll see how the area of a circle is calculated.
OpenLearn - An introduction to exoplanets
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