The length of a rope, to which a cow is tied, is increased from 19m to 30m. How much additional ground will it be able to graze? Assume that the cow is able to move on all sides with equal ease.

The length of a rope, to which a cow is tied, is increased from 19m to 30m. How much additional ground will it be able to graze? Assume that the cow is able to move on all sides with equal ease. Correct Answer 1794 sq.m

The additional area = π<math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>(</mo><msup><msub><mi>r</mi><mn>1</mn></msub><mn>2</mn></msup><mo> - </mo><msup><msub><mi>r</mi><mn>2</mn></msub><mn>2</mn></msup><mo>)</mo><mi mathvariant = "normal">&#x3C0;</mi><mo>(</mo><msup><mn>30</mn><mn>2</mn></msup><mo> - </mo><msup><mn>19</mn><mn>2</mn></msup><mo>)</mo></math> = 1694 sq. m
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