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

Asked by tanvi.choudhary | 29th Dec, 2018, 07:42: AM

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 | 31st Dec, 2018, 11:09: AM