The Shulbasutras of Baudhayana, Apastamba, Katyayana and Manava: With Text, English Translation and Commentary c8.t9.9

c8.t9.9

For the wing, the rectangle to be taken should have its side *AD* as 9 *aratnis* (= 216 *aṅgulas*) and *AB* 6 *aratnis* (144 *aṅg.*); the area is 54 sq. *aratnis*. The bending (*nirṇāma*) is made as before, the distance *EP* being 3 *aratnis* (72 *aṅgulas*). For the plumages, 6 rectangles DGK₁L₁, L₁K₁K₂L₂ etc. are fitted at the end of the tail, diagonally intersected and outer halves rejected. Now, each such rectangle is *adhyardhā-pañcamī*, that is, 36 × 24 sq. *aṅgulas* or 1½ sq. *aratni*; the area of 6 of them is 9 sq. *aratnis* and that of the 6 plumages (*patra*) after rejection of half is 4½ sq. *aratnis*. The total area of each wing is, therefore, 58½ sq. *aratnis* and that of two wings 117 sq. *aratnis*.