एक वर्गाकार रूमाल पर, नौ वृत्ताकार डिज़ाइन बने हैं, जिनमें से प्रत्येक की त्रिज्या \( 7 \mathrm{...

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एक वर्गाकार रूमाल पर, नौ वृत्ताकार डिज़ाइन बने हैं, जिनमें से प्रत्येक की त्रिज्या \( 7 \mathrm{~cm} \) है (देखिए आकृति )। रूमाल के शेष भाग का क्षेत्रफल ज्ञात कीजिए।
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