Arthashastra

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प्राकारम् उभयतो मेण्ढकम् अध्यर्ध दण्डं कृत्वा प्रतोली षट् तुला अन्तरं द्वारं निवेशयेत् पञ्च दण्डाद् एक उत्तरम् आ अष्ट दण्डाद् इति चतुर् अश्रं षड् भागम् आयामाद् अधिकम् अष्ट भागं वा ॥

Having made on both sides of the rampart a circular hole of a danda-and-a-half in diametre, an entrance gate (to the fort) one-sixth as broad as the width of the street shall be fixed. A square (chaturásra) is formed by successive addition of one danda up to eight dandas commencing from five, or in the proportion, one-sixth of the length up to one-eighth.

english translation

prAkAram ubhayato meNDhakam adhyardha daNDaM kRtvA pratolI SaT tulA antaraM dvAraM nivezayet paJca daNDAd eka uttaram A aSTa daNDAd iti catur azraM SaD bhAgam AyAmAd adhikam aSTa bhAgaM vA ॥

hk transliteration by Sanscript