Home › UP Board Class 10 › mathematics › Surface Areas and Volumes › The curved surface area of a sphere of radius r is
The curved surface area of a sphere of radius r is
A2 pi r squared
B4 pi r squared
C(4/3) pi r cubed
Dpi r squared
Answer & Solution
Correct answer: B. 4 pi r squared
1. Standard formula for sphere surface.
2. SA = 4 × pi × r squared.
3. Hence option A.
_Source: NCERT Class 10 Mathematics, Ch 12 "Surface Areas and Volumes", §12.2_
Related questions
A hollow cylindrical pipe has outer radius 4 cm, inner radius 3 cm and height 10 cm. The vA cylindrical bucket of height 14 cm and base radius 7 cm is full of water and is poured iA solid wooden toy has 4 cm cube + 4 cm hemispherical depression. The volume of wood isA medicine capsule is in the shape of a cylinder of length 14 mm and radius 2.5 mm with twThree solid metallic spheres of radii 6 cm, 8 cm and 10 cm are melted to form a single sphA pencil sharpened at one end represents a combination of two shapes:A solid is composed of a cone and a hemisphere of equal radius. The ratio of the volumes oA sphere of radius r is inscribed in a cube. The ratio of the volume of the sphere to the