Mathematics · Mensuration
एक ठोस धात्विक गोले की त्रिज्या 15 सेमी है। इसे पिघलाकर समान अनुप्रस्थ काट (uniform cross-section) वाला 15 मिमी त्रिज्या का एक लंबा तार बनाया जाता है। तार की लंबाई ज्ञात कीजिए।
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