Context: The first Armenian churches were built between the 4th and 7th century, beginning when Armenia converted to Christianity, and ending with the Arab invasion of Armenia. The early churches were mostly simple basilicas, but some with side apses. By the fifth century the typical cupola cone in the center had become widely used. By the seventh century, centrally planned churches had been built and a more complicated niched buttress and radiating Hrip'simé style had formed. By the time of the Arab invasion, most of what we now know as classical Armenian architecture had formed.

Question: When were early Armenian Christian churches built?
Answer: between the 4th and 7th century

Question: In which century did Armenia become Christian?
Answer: 4th

Question: What radiating style are some Armenian churches built with?
Answer: Hrip'simé

Question: When were Armenian churches built with center cupola cones?
Answer: fifth century

Question: When were Armenian churches built with niched buttresses?
Answer: seventh century

Question: When were the first Arab structures built?
Answer: Unanswerable

Question: What style of architecture so some Arab structures use?
Answer: Unanswerable

Question: What had formed when Hrip'sime became Christian?
Answer: Unanswerable

Question: What had become widely used in early churches?
Answer: Unanswerable

Question: What did some churches sometimes have in the fifth century?
Answer: Unanswerable