Surya Siddhanta
तद्बाहुफलवर्गैक्यान् मूलम् कर्णश् चलाभिधः। त्रिज्याभ्यस्तम् भुजफलम् चलकर्णविभाजितम् ॥
Add the square of the result (just found) to that of the sine of the 2nd Bhuja-phala: the square root of the sum is the Śíghra-karṇa or 2nd hypothenuse. Find the (2nd) Bhuja-phala of the planet (as mentioned in śloka 39th;) multiply it by the radius and divide the product by the 2nd hypothenuse (above found).
english translation
tadbAhuphalavargaikyAn mUlam karNaz calAbhidhaH। trijyAbhyastam bhujaphalam calakarNavibhAjitam ॥
hk transliteration by Sanscript