What is the area of a circle whose radius is equal to the side of a square whose perimetre is 84 metres? यदि एक वर्ग का परिमाप 84 मी. है और वर्ग की भुजा एक वृत्त के त्रिज्या के समान है तो वृत्त का क्षेत्रफल क्या होगा?

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