Mathematics · Mensuration
4 सेमी आधार व्यास वाले एक ठोस बेलन को पिघलाकर 12 सेमी बाहरी व्यास, 0.5 सेमी मोटाई और 15 सेमी ऊंचाई वाला एक खोखला बेलन ढाला जाता है। ठोस बेलन की ऊंचाई (सेमी में) ज्ञात कीजिए (2 दशमलव स्थानों तक पूर्णांकित)।
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