the sum of the diameters of two circles is 28 m


The sum of the diameters of two circles is 2.8 m and their difference of circumferences is 0.88m. Find the radii of the two circles  (Ans: 77, 63)

Ans:    d1 + d2 = 2.8 m= 280cm

r1+r2 = 140

2 Π (r1 - r2) = 0.88m = 88cm

r1 - r2 =88/2Π = 88x7/44 = 2 x 7 = 14

r1+r2 = 140

r1-r2  = 14

2r1 = 154 r1=77

r2 = 140 - 77 = 63

r1 = 77 cm, r2= 63cm

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Mathematics: the sum of the diameters of two circles is 28 m
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