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`        in the adjoining figure the area enclosed between the concentric circles is 770 cm2 if the radius of the outer circle is 21 cm calculate the radius of inner. circle`
2 years ago

```							Please enclose the proper supporting document
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2 years ago
```							Given :Radius of outer circle = 21cm.Area between inner & outer circle = 770cm2. Area of outer circle = r2                                     = 22/7 x 212                                     = 1386cm2. Area of innercircle = 1386-770                              = 616cm2. r2 = 616      r2 = 616 x 7/22      r  =  14cm. Therefore radius of innercircle = 14cm.
```
2 years ago
```							here we havethe radius of outer circle= 21cmarea between the concentric circle =7702 R2 = 22/7*21*21           =1386cm r2  =1386cm -770cm          = 616cmso,radius of inner circle r2 = 22/7*r2616 =22/7*r2616*7/22 = r2196 = r2142 = r214 = rhence radius = 14 cm
```
one year ago
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