CBSE Class 9 Answered
Find the area of a triangular field the lengths of whose sides are 275 m, 660 m and 715 m. What is the cost of cultivating the field at the rate of Rs. 200 per hectare?
Asked by Topperlearning User | 31 Mar, 2014, 13:04: PM
Let
, and
S = ![1 half left parenthesis a plus b plus c right parenthesis equals 1 half left parenthesis 275 plus 660 plus 715 right parenthesis equals 825](https://images.topperlearning.com/topper/tinymce/cache/415b96d47a99a51ef6f8a790bd3db66e.png)
![1 half left parenthesis a plus b plus c right parenthesis equals 1 half left parenthesis 275 plus 660 plus 715 right parenthesis equals 825](https://images.topperlearning.com/topper/tinymce/cache/415b96d47a99a51ef6f8a790bd3db66e.png)
Area of the triangle is given by
![](https://images.topperlearning.com/topper/questions/1155_image008.gif)
![](https://images.topperlearning.com/topper/questions/1155_image002.gif)
= ![](https://images.topperlearning.com/topper/questions/1155_image056.gif)
![](https://images.topperlearning.com/topper/questions/1155_image056.gif)
= ![](https://images.topperlearning.com/topper/questions/1155_image057.gif)
![](https://images.topperlearning.com/topper/questions/1155_image057.gif)
Thus, area of field = 90750 m2
Now, the cost of cultivating 10000m2 = Rs. 200
![](https://images.topperlearning.com/topper/questions/1155_image010.gif)
![200 over 10000 cross times 90750](https://images.topperlearning.com/topper/tinymce/cache/99038a6aeaa76a2eb4c11580f4c5d2c6.png)
= Rs. 1815
Answered by | 31 Mar, 2014, 15:04: PM
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