CBSE Class 10 Answered
maths doubt
![question image](http://images.topperlearning.com/topper/new-ate/top_mob167284638431093054020230104_194547.jpg)
Asked by dixitayush414 | 04 Jan, 2023, 21:03: PM
Qn.(17)
total number of trees planted by students = 3 ( 1 +2 +3 + ......................+10+11+12 )
multiplication factor 3 in above expression is for 3 sections in each class .
total number of trees planted by students = 3 × (12 × 13) / 2 = 234
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Qn.(18)
![](https://images.topperlearning.com/topper/tinymce/imagemanager/files/8d6dd2ca91c7789f3d33637f8c34d9c763b5a97273c6c9.00490298g2.png)
Spiral consists of 13 semi-circle as shown in figure.
Radius of each semicircle increases by 0.5 cm from previous one and starting radius is 0.5 .
Total length =
( 0.5 + 1.0 + 1.5 + ......................6.0 + 6.5 ) cm
![straight pi](https://images.topperlearning.com/topper/tinymce/cache/0e739830588d5400a9e7afe62b14359c.png)
Total length =
× 0.5 ( 1 + 2 + 3 + ......................12 + 13 ) cm
![straight pi](https://images.topperlearning.com/topper/tinymce/cache/0e739830588d5400a9e7afe62b14359c.png)
Total length =
× 0.5 × [ (13 × 14 ) /2 ] = 45.5
cm
![straight pi](https://images.topperlearning.com/topper/tinymce/cache/0e739830588d5400a9e7afe62b14359c.png)
![straight pi](https://images.topperlearning.com/topper/tinymce/cache/0e739830588d5400a9e7afe62b14359c.png)
Answered by Thiyagarajan K | 04 Jan, 2023, 22:08: PM
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