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একটি ত্রিভুজাকৃতি মাঠের বাহুগুলোর দৈর্ঘ্য যথাক্রমে 20m ,21 m & 29 m হলে এর ক্ষেত্রফল কত?

200 m^{2}

210 m^{2}

290 m^{2}

300 m^{2}

ANSWER : 2

Descrption

এখানে,  <math xmlns = "http://www.w3.org/1998/Math/MathML"><mspace linebreak = "newline"/><mi>S</mi><mo> = </mo><mfrac><mrow><mn>20</mn><mo>  +  </mo><mn>21</mn><mo>  +  </mo><mn>29</mn></mrow><mn>2</mn></mfrac><mo> = </mo><mn>35</mn><mspace linebreak = "newline"/><mtext>
∴ক্ষেত্র  = </mtext><msqrt><mn>35</mn><mo>(</mo><mn>35</mn><mo> - </mo><mn>20</mn><mo>)</mo><mo>(</mo><mn>35</mn><mo> - </mo><mn>21</mn><mo>)</mo><mo>(</mo><mn>35</mn><mo> - </mo><mn>29</mn><mo>)</mo></msqrt><mspace linebreak = "newline"/><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> = </mo><msqrt><mn>35</mn><mo>  ×  </mo><mn>15</mn><mo>  ×  </mo><mn>14</mn><mo>  ×  </mo><mn>6</mn></msqrt><mspace linebreak = "newline"/><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> = </mo><msqrt><mn>5</mn><mo>  ×  </mo><mn>7</mn><mo>  ×  </mo><mn>3</mn><mo>  ×  </mo><mn>5</mn><mo>  ×  </mo><mn>2</mn><mo>  ×  </mo><mn>7</mn><mo>  ×  </mo><mn>2</mn><mo>  ×  </mo><mn>3</mn></msqrt><mspace linebreak = "newline"/><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> </mo><mo> = </mo><mn>3</mn><mo>  ×  </mo><mn>7</mn><mo>  ×  </mo><mn>5</mn><mo>  ×  </mo><mn>2</mn><mo> = </mo><mn>210</mn><msup><mi>m</mi><mn>2</mn></msup></math>
[যেখানে , <math xmlns = "http://www.w3.org/1998/Math/MathML"><mi>s</mi><mo> = </mo><mfrac><mrow><mi>a</mi><mo>  +  </mo><mi>b</mi><mo>  +  </mo><mi>c</mi></mrow><mn>2</mn></mfrac></math> এখানে, a = 20 , b = 21 , c = 29]

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