CBSE Class 10 Answered
maths doubt

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)

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

Total length =
× 0.5 ( 1 + 2 + 3 + ......................12 + 13 ) cm

Total length =
× 0.5 × [ (13 × 14 ) /2 ] = 45.5
cm


Answered by Thiyagarajan K | 04 Jan, 2023, 22:08: PM
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