Smashwords – HCR's Infinite or Convergence Series (Calculations of Volume, Surface Area of Oblique Frustum, Perimeter, Major & Minor Axes & Eccentricity of Elliptical-section of a Right Circular Cone) – a book
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geometry - Evaluate the eccentricity of the elliptical section of a right circular cone - Mathematics Stack Exchange
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conic sections - Volume, Lateral Area, and Surface Area of an Elliptic Conical Frustum - Mathematics Stack Exchange
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