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Question

If the difference between the circumference and diameter of a circle is 60 cm, then the radious of the circle is .

7 cm

9 cm

10 cm

14 cm

ANSWER : 4

Short Descrption

Descrption

<pre>
ATQ,
<math xmlns = "http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>&#x3BB;</mi><mi>r</mi><mo> - </mo><mn>2</mn><mi>r</mi><mo> = </mo><mn>60</mn><mspace linebreak = "newline"/><mo>&#x21D2;</mo><mn>2</mn><mi>r</mi><mo>&#xA0;</mo><mo>(</mo><mi>&#x3BB;</mi><mo> - </mo><mn>1</mn><mo>)</mo><mo> = </mo><mn>60</mn><mspace linebreak = "newline"/><mo>&#x21D2;</mo><mi>r</mi><mo> = </mo><mfrac><mn>60</mn><mrow><mn>2</mn><mo>(</mo><mi>&#x3BB;</mi><mo> - </mo><mn>1</mn><mo>)</mo></mrow></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mn>30</mn><mrow><mstyle displaystyle = "true"><mfrac><mn>22</mn><mn>7</mn></mfrac></mstyle><mo> - </mo><mn>1</mn></mrow></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mn>30</mn><mstyle displaystyle = "true"><mfrac><mrow><mn>22</mn><mo> - </mo><mn>7</mn></mrow><mn>7</mn></mfrac></mstyle></mfrac><mspace linebreak = "newline"/><mo> = </mo><mfrac><mn>30</mn><mn>15</mn></mfrac><mo>&#xD7;</mo><mn>7</mn><mspace linebreak = "newline"/><mo>.</mo><mo>'</mo><mo>.</mo><mo>&#xA0;</mo><mi>r</mi><mo>&#xA0;</mo><mo> = </mo><mn>14</mn><mo>&#xA0;</mo><mi>c</mi><mi>m</mi><mo>&#xA0;</mo></math>

</pre>

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