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Find the area of the space enclosed by two concentric circles of radii 25cm and 17cm

Asked by tanvi.choudhary 29th December 2018, 7:42 AM
Answered by Expert
Answer:
According to the question,
 
r1 = 25 cm and r2 = 17 cm
 
The area of the space enclosed by two concentric circles 
begin mathsize 16px style πr subscript 1 space end subscript superscript 2 space minus space πr subscript 2 space end subscript superscript 2 equals straight pi open parentheses straight r subscript 1 space end subscript superscript 2 space minus space straight r subscript 2 space end subscript superscript 2 close parentheses
equals 22 over 7 cross times open parentheses 25 squared minus 17 squared close parentheses
equals 22 over 7 cross times open parentheses 625 minus 289 close parentheses
equals 22 over 7 cross times 336
equals 22 cross times 48
equals 1056 space cm squared end style
Answered by Expert 31st December 2018, 11:09 AM
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