the sum of radii of two circles is 17cm and the difference of their circumference is 44. find the two redii?
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sum of radii is 17 and difference of circumference 44 .
by this method can be solve
R+r =17
C-c=44
circumference
2πR-2πr=44
2π[R-r]=44
R+r= 44 ×7/44
R-r=7
R-r=7
R+r=17
by substitution method
2R=24
R=12
r=17-12
r=5
by this method can be solve
R+r =17
C-c=44
circumference
2πR-2πr=44
2π[R-r]=44
R+r= 44 ×7/44
R-r=7
R-r=7
R+r=17
by substitution method
2R=24
R=12
r=17-12
r=5
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