Question
Tue September 01, 2009 By: Pranav Jain

Ncert Book Wuestion

Expert Reply
Wed September 02, 2009

 

 

We assume you are refering to the following problem statement.

NCERT Class X, Chapter 3, Ex. 13.1 Q3.

Solution.

Total surface area of the toy = Curved surface area of the cone + Curved surface area of the hemisphere.

= πrl + 4πr2/2

= πrl + 2πr2

Height of the cone = total height - radius of the hemisphere = 15.5 - 3.5 = 12 cm

Slant height of the cone, l  = (122 + 3.52) = 156.25 = 12.5 cm

Hence

TSA = πrl + 2πr2

 

= (3.14)(3.5)(12.5) + 2(3.14)(3.5)2

= 137.38  + 76.93

= 214.31 cm2

Regards,

Team,

TopperLearning.

 

 

 

 

 

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