#pitch_angle_of_a_spiral
Pitch angle of a spiral
Property of spirals
In the geometry of spirals, the pitch angle or pitch of a spiral is the angle made by the spiral with a circle through one of its points, centered at the center of the spiral. Equivalently, it is the complementary angle to the angle made by the vector from the origin to a point on the spiral, with the tangent vector of the spiral at the same point. Pitch angles are frequently used in astronomy to characterize the shape of spiral galaxies.
Thu 4th
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