the area of a circular ring enclosed between two concentric circles is 286cm square. if the difference between their radii is 7 cm, then the radii of these circles are?
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Answered by
217
let R and r is the radii of outer and inner circle respectively.
a/c to question,
R -r = 7 cm --------------(1)
πR² -πr² = 286 cm²
π(R -r)( R + r ) = 286 cm ²
22/7 × 7 (R + r) = 286 cm²
(R + r) = 13 ---------(2)
from equation (1) and (2)
R =10 cm
r = 3 cm
a/c to question,
R -r = 7 cm --------------(1)
πR² -πr² = 286 cm²
π(R -r)( R + r ) = 286 cm ²
22/7 × 7 (R + r) = 286 cm²
(R + r) = 13 ---------(2)
from equation (1) and (2)
R =10 cm
r = 3 cm
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71
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