Finds the volume of the truncated cone

figure.PNG

findTruncatedConeVolume.js

// Ref: https://www.madematika.net/2015/10/rumus-luas-selimut-dan-volume-kerucut.html
function (D1, D2, t) {
  const pi = Math.PI;
  let r1 = D1/2;
  let r2 = D2/2;
  return (1/3) * pi * t * (Math.pow(r2, 2) + r2 * r1 + Math.pow(r1, 2));
}

// Ref: https://solusimatematika85.blogspot.com/2017/08/mencari-volume-kerucut-yang-terpotong.html
function (D1, D2, t1) {
  const pi = Math.PI;
  let r1 = D1 / 2;
  let r2 = D2 / 2;

  // Find the remaining height of the cone
  let t2 = (t1 * r2) / (r2 - r1);

  // Find the remaining volume of the cone
  let v2 = (1 / 3) * pi * Math.pow(r1, 2) * t2; // cubic
  
  // Find the volume of the whole cone
  let V = (1 / 3) * pi * Math.pow(r2, 2) * (t1 + t2); // cubic
  
  // Finds the volume of the truncated cone
  let v1 = (V - v2); // cubic

  return v1;
}