किसी गोले की त्रिज्या दो गुनी की जाये, तब सम्पूर्ण पृष्ठ क्षेत्रफल कितना गुना हो जाऐगा?
A. double
B. three times
C. Four times
D. None of the mentioned
A. double
B. three times
C. Four times
D. None of the mentioned
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Correct Answer – C
Let the original radius be `r`
`implies` Area `=4pir^(2)`
New area `=4pi(2r^(2))=16pir^(2)`
`implies` New area of 4 times the old area