यदि 21 सेमी भुजा वाली एक वर्गाकार शीट को मोड़कर एक बेलन बनाया जाता है जिससे उसके दो विपरीत किनारे आपस में मिल जाते हैं, तो बनने वाले बेलन का वक्र पृष्ठीय क्षेत्रफल कितना होगा?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?