Pages
(seq. 73)
20 14 15 20 20 20/109 20 20 17 15 20 23/115 15 20 18 17 18 15/103 20 17 20 17 14/88 20 18 18 17 17/90/[505?]
505 18 15 17 18 17 20/105 18 15 18 20 15 17/103 21 15 21 18 20/95/808
(seq. 75)
[Triangle figure] 20 x 13 x 11
[equation] ——² 20² — x + 11 = 13²— x x + 11 400 — x² + 11x 11x + 121 400 — x² + 22x + 121 = 169 — x