Question

द सरकम्फ्रेंस आफ टू कॉन्सन्ट्रिक सर्कल्स 1.1 मीटर सेंटीमीटर एंड 1 54 सेंटीमीटर कैलकुलेट द डिफरेंस बिटवीन द रेड्डी is​

Answer 1

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The circumference of two concentric circles are 121cm and 154 cm. calculate the difference between their radii.

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Solution

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Given circumference of circle A= 121 cm.

Given circumference of circle B= 154 cm.

now r

1

be radius of circle A & r

2

be radius of circle B.

now 2πr

1

=121

r

1

=

2π

121

...(1)

and 2πr

2

=154

r

2

=

2π

154

...(2)

now r

2

−r

1

=

2π

154

−

2π

121

=

2π

1

[154−121]

r

2

−r

1

=

2π

33

=5.25