Question

In an adjoining figure, the area enclosed between the concentric circles is 770cm2 . If the radius of outer circle is 21 cm, calculate the radius of inner circle​

Answer 1

Answer: 14 cm

Step-by-step explanation:

Please see the image below

Answer 2

Answer:

Area of Outter circle = pi*r^

so, 22/7*21*21=1306 now 1306-22/7*r^=770

-22/7r^=770-1306

-22/7r^=-616

r^616*7/22

28*7=196

√196=14

Step-by-step explanation:

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