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If the area of a circle is 154 sq. cm, t...

If the area of a circle is 154 sq. cm, then find the ratio between the circumferences of this circle and another circle with a radius 21 cm.
यदि किसी वृत्त का क्षेत्रफल 154 वर्ग cm है, तो उस वृत्त की परिधि और 21 cm त्रिज्या वाले किसी दूसरे वृत्त की परिधियों का अनुपात है:

A

`1:3`

B

`2:3`

C

`2:1`

D

`1:2`

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