एक 17 सेमी लम्बे और 7 सेमी चौड़े आयत को चौड़ाई के परित: घुमाने पर बने बेलन काआयतन और वक्र पृष्ठ ज्ञात कीजिए।
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the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
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