alleryഒരു അർദ്ധഗോളാകൃതിയിലുള്ള താഴികക്കുടത്തിന് 7 cm ആരമുണ്ട്. അതിൻ്റെ വളഞ്ഞ ആവരണത്തിന് എത്ര മെറ്റീരിയൽ ആവശ്യമാണ്? π = 22/7 ഉപയോഗിക്കുക.
A308 cm²
B154 cm²
C462 cm²
D616 cm²
Answer & Solution
Correct answer: A. 308 cm²
ഒരു അർദ്ധഗോളത്തിൻ്റെ വളഞ്ഞ വിസ്തീർണ്ണം 2πr² = 2 × (22/7) × 49 = 308 `cm²` ആണ്.
Keep practising Mensuration
Browse all Mensuration questions for RPF Constable, or explore more Arithmetic topics.
Related questions
Mensuration: choose the measureA circular sector of radius 21 cm has perimeter 86 cm. Find its area; use π = 22/7.A rhombus has diagonals 16 cm and 30 cm. What are its area and perimeter?A trapezium has parallel sides 18 m and 30 m, with height 10 m. Paving costs ₹12 per m². TA full cylinder (r=6,h=8 cm) contains a solid cone of the same r,h. Pour its water into a A radius-7 cm cylinder of height 10 cm has a matching hemisphere on top. Area exposed exclA radius-6 cm sphere is melted into cones of radius 2 cm and height 3 cm, with no loss. HoA spherical ball has radius 3 cm. How many cubic centimetres does it occupy? Use π = 3.14.