Question

The circumferences of two circles are 264 meters and 352 meters. Find the difference between the areas of the larger and the smaller circles ?
A) 2413 sq.m
B) 1234 sq.m
C) 4312 sq.m
D) 2143 sq.m

Answer 1

The circumferences of two circles are 264 meters and 352 meters. Find the difference between the areas of the larger and the smaller circles ?
A) 2413 sq.m
B) 1234 sq.m
C) 4312 sq.m
D) 2143 sq.m

Answer:   C) 4312 sq.m 

SOLUTION

Let the radii of the smaller and the larger circles be 's' m and 'l' m respectively.  

 2πs2πs = 264 and 2πl2πl = 352  

 

 s = 2642π2642π and l = 3522π3522π   

Difference between the areas =πl2−πs2πl2-πs2   

  = π(1762π2−1322π2)π1762π2-1322π2 

  = 1762π−1322π1762π-1322π  

  = (176 - 132)(176 + 132) / ππ  

  = (44 x 308) / (22/7) = 4312 sq.m

Answer 2

Hiiii....

Smaller radius is 21 cm....