There are different kind of religion. 9 century (900) were there between the arrival of Buddhist Influence In Sri Lanka and in Angkor Wat.
- Buddhism was known to be introduced to Sri Lanka in the 3rd century BCE. This was through the arrival of King Aśoka’s son, who was called Arahant Mahinda that didst come from India.
The Buddhist was introduced to Angkor Wat in the 12th century. It was said to be first given to the Hindu god Vishnu, Angkor Wat was known to have a Buddhist temple at the end of the 12th century.
Conclusively, since Sri Lanka is 3 century and Angkor Wat is in 12 century, you subtract the years, 1200-300 years will give you 900 years. Note that a century is 100 years.
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