Statistics for Top 15 largest Orthodox church in World

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Interior are in m2	Country	Answer	% Correct
3,650	Serbia	Church of Saint Sava	71%
4,700	Russia	Cathedral of Christ the Saviour	29%
3,990	Russia	Cathedral of Christ the Saviour	29%
6,100	Romania	People's Salvation Cathedral	29%
3,170	Bulgaria	Alexander Nevsky Cathedral	14%
5,000	Georgia	Holy Trinity Cathedral	0%
4,000	Russia	Kazan Cathedral	0%
3,000	Russia	Kronstadt Naval Cathedral	0%
2,900	Russia	Novocherkassk Ascension Cathedral	0%
7,000	Russia	Saint Isaac's Cathedral	0%
3,000	Russia	Smolny Cathedral	0%
2,500	Greece	St Andrew's Cathedral, Patras	0%
3,100	Ukraine	Transfiguration Cathedral	0%
3,500	Russia	Trinity Izmailovsky Cathedral	0%
3,000	Georgia	Tsminda Sameba Cathedral	0%