the sum of radii of two circles is 14 cm and the difference of their circumference is 15 cm find the radii of two circles
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☆ let R and r be two radii of two circles.
☆ R+r = 14 ----equ (1)
☆ 2 × pie × R - 2 × pie × r
=> 2×pie ( R-r) = 15
=> R-r = 8.72 --- equ ( 2) ( pie = 3.14)
Adding equ (1) and (2)
R+r = 14
R-r = 8.72
________________
R = 11.36 cm
and r = 2.64 cm
_______________________________
Hope it helps. .
HEARTTHROB
__________________
☆ let R and r be two radii of two circles.
☆ R+r = 14 ----equ (1)
☆ 2 × pie × R - 2 × pie × r
=> 2×pie ( R-r) = 15
=> R-r = 8.72 --- equ ( 2) ( pie = 3.14)
Adding equ (1) and (2)
R+r = 14
R-r = 8.72
________________
R = 11.36 cm
and r = 2.64 cm
_______________________________
Hope it helps. .
HEARTTHROB
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