खोखले (वलयाकार) बेलन का पूर्ण पृष्ठ का सूत्र क्या होता है? Khokhle Belan Ka Purn Prishth Ka Sutra Kya Hota Hai?
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खोखले (वलयाकार) बेलन का पूर्ण पृष्ठ का सूत्र क्या होता है? Khokhle (Valyakar) Belan Ka Purn Prishth Ka Sutra Kya Hota Hai?

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खोखले (वलयाकार) बेलन का पूर्ण पृष्ठ (Khokhle Belan Ka Purn Prishth) —

$=2 \pi(R+r)(R-r+h) $

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