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  1. Pyramidal Frustum -- from Wolfram MathWorld

  2. Frustum - Wikipedia

  3. Volume of a Pyramidal Frustum Calculator

  4. Frustums: Not Frustrating but Fascinating – The Math Doctors

  5. Pyramidal Frustum Calculator

  6. Frustum - Definition, Types, Properties, Formulas - Cuemath

  7. Frustum of a Pyramid: Definition, Properties, Volume - EMBIBE

  8. Pyramidal Frustum - Michigan State University

  9. pyramidal frustum - Wolfram|Alpha

  10. Frustum of a Pyramid - eMathZone