Natyashastra
अष्टहस्तं तु कर्तव्यं रङ्गपीठं प्रमाणतः । चतुरश्रं समतलं वेदिकासमलङ्कृतम् ॥ ९८॥
The stage should be constructed with a measurement of eight hands, according to the standard. It should be level, with a square shape, and adorned with decorative elements.
english translation
aSTahastaM tu kartavyaM raGgapIThaM pramANataH । caturazraM samatalaM vedikAsamalaGkRtam ॥ 98॥
hk transliteration by Sanscript