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एक शंकु जिसकी त्रिज्या `r/2` और तिर्यक ऊँचाई `2l` है, का कुल पृष्ठीय क्षेत्रफल होगा -

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एक शंकु जिसकी त्रिज्या `r/2` और तिर्यक ऊँचाई `2l` है, का कुल पृष्ठीय क्षेत्रफल होगा -
A. `2pi r(l+r)`
B. `pi r(l+r/4)`
C. `pi r(l+r)`
D. `2pi rl`
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Correct Answer - B
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