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An introduction to exoplanets
An introduction to exoplanets

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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.