LanLab

Aryabhata was the great Indian mathematician , astronomer. He was one who popularize the concept of zero and its use in number system. His main works includes study of arithmetic, plane geometry, trigonometry. Direct details of his work are known only from the Aryabhatiya, which includes section of 33 verses called ganitpada which covers mensuration.
The section includes the verse

चतुरधिकं शतमष्टगुणं द्वाषष्टिस्तथा सहस्राणाम्
अयुतद्वयविष्कम्भस्यासन्नो वृत्तपरिणाहः.

"caturadhikaṃ śatamaṣṭaguṇaṃ dvāṣaṣṭistathā sahasrāṇām
ayutadvayaviṣkambhasyāsanno vṛttapariṇāhaḥ."

"Add four to 100, multiply by eight, and then add 62,000. By this rule the circumference of a circle with a diameter of 20,000 can be approached."

The above verse tells the circumference of circle with diameter 20000 to be 62832, which gives value of pi to be 3.1416 with error < .0001

He has inspired the Indian mathematics for centuries, and gave new aspect, new direction to world mathematics.