এটা পুতলা একে ব্যাসার্ধযুক্ত এটা অর্ধগােলকৰ ওপৰত 3.5 cm ব্যাসাধযুক্ত এটা শকুন
গঠিত! পুতলাটোৰ মূঠ উচ্চতা হ’ল 15:5 cm. পুতলাটোৰ মুঠ পৃষ্ঠকালি নির্ণয় কৰা।
( = 22 বুলি ধৰিা )
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Given এটা পুতলা একে ব্যাসার্ধযুক্ত এটা অর্ধগােলকৰ ওপৰত 3.5 cm ব্যাসাধযুক্ত এটা শকুনগঠিত! পুতলাটোৰ মূঠ উচ্চতা হ’ল 15:5 cm. পুতলাটোৰ মুঠ পৃষ্ঠকালি নির্ণয় কৰা।
- A toy is in the form of a cone of radius 3.5 cm mounted on a hemisphere of same radius. The total height of the toy is 15.5 cm. Find the total surface area of the toy.
- So we need to find the total surface area of the toy.
- Now we have a cone and in the base of the cone there is a hemisphere and the radius is 3.5 cm. The total height of the toy is 15.5 cm.
- Radius = 3.5 cm
- So the height of the cone will be 15.5 – 3.5 = 12 cm
- So slant height of the cone l = √r^2 + h^2
- = √3.5^2 + 12^2
- = √12.25 + 144
- = √156.25
- = 12.5 cm
- Now surface area of toy = curved surface area of cone + curved surface area of hemisphere
- = πrl + 2πr^2
- = πr (l + 2r)
- = 22/7 x 3.5 (12.5 + 7)
- = 22/7 x 3.5 x 19.5
- = 1501.5 / 7
- = 214.5 sq cm
- So surface area of the toy is 214.5 sq cm
Reference link will be
https://brainly.in/question/1113528
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