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radius
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A geometric diagram of a circular segment with radius labeled L, central angle labeled theta, arc length marked as L times theta, and a vertical segment inside labeled L times sine theta.
Understand the relative size of the Sun, the Moon, and other solar system objects
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Understand the relative size of the Sun, the Moon, and other solar system objects
Learn about the comparative size of various solar system objects.
Video: © MinutePhysics (A Britannica Publishing Partner)

Images

circle segment
Figure 7: A segment of a circle of radius L (see text).
Encyclopædia Britannica, Inc.