text: /**
   * Draws a parallelogram.
   * 
   * @author {@link https://www.khanacademy.org/profile/BobLyon/projects Bob Lyon}
   *
   * @link https://www.khanacademy.org/cs/-/4747962019348480
   * 
   * @category Shape
   *
   * @param {number} ax x-coordinate of the first vertex
   * @param {number} ay y-coordinate of the first vertex
   * @param {number} bx x-coordinate of the second vertex
   * @param {number} by y-coordinate of the second vertex
   * @param {number} cx x-coordinate of the third vertex
   * @param {number} cy y-coordinate of the third vertex
   *
   * @example
   * parallelogram(50, 50, 200, 50, 100, 100);
   *
   * @see {@link rhombus}
   */
  parallelogram = (ax, ay, bx, by, cx, cy) => {
      const dx = bx - ax;
      const dy = by - ay;
      p.quad(ax, ay, bx, by, cx + dx, cy + dy, cx, cy);
  };
  