alleryA circular washer has radii 7 cm and 3.5 cm; its metal area? π = 22/7.
A154 cm²
B115.5 cm²
C192.5 cm²
D38.5 cm²
Answer & Solution
Correct answer: B. 115.5 cm²
The metal area is (22/7) × (7² − 3.5²) = 115.5 cm².
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 hemispherical dome has radius 7 cm. Its curved covering needs how much material? Use π =