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ICSE Class 7 Answered

Find the area of the space enclosed by two concentric circles of radii 25cm and 17cm
Asked by tanvi.choudhary | 29 Dec, 2018, 07:42: AM
answered-by-expert 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 Sneha shidid | 31 Dec, 2018, 11:09: AM
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