Question

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Two concentric circles are of radii 7 cm and rcm respectively, wherer >7.Achord of the larger
circle, oflength 48 cm, touches the smaller circle. Find the value of r​

Answer 1

Answer:

25

Step-by-step explanation:

chord touches smaller circle

so it becomes tangent for smaller one

so it divides half and angle with 90 degrees

hence in a right angle triangle one side is 7 CM and another one is half of chord length 24 CM and hypotenuse is r CM

so

sqrt(r^2-7^2)=24^2

r=25