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Question

The radius and the height of a cylinder are 7 cm and 10 cm respectively. Find the ratio of the numerical value of its total surface area to that of its curved surface.

किसी वेलन की त्रिज्या और ऊँचाई क्रमशः 7 सेमी और 10 सेमी हैं। उसके कुल पृष्ठीय क्षेत्रफल तथा उसके वक्राकार क्षेत्रफ़ल के अंकीय मान का अनुपात ज्ञात करें।

A
17 :10
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B
7 : 5
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C
17 : 12
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D
7 : 3
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Solution

The correct option is A 17 :10
The required ratio = 2π(r+h)2πrhr+hh17:10

अपेक्षित अनुपात = 2π(r+h)2πrhr+hh17:10

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