Question

Q.5 In fig ABCD is a square. Area of the shaded circular ring is
286 cm". The difference between the radii of the two circles is 7 cm.
Find the radius of each circle and the ratio of the area of the
unshaded part of the square to the area of shaded circular ring.​

Answer 1

Answer:

Step-by-step explanation:

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

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