Advertisements
Advertisements
प्रश्न
Find the surface area of a sphere of diameter 3.5 cm .
उत्तर
Diameter = 3.5cm
Radius - 3. 5cm/ 2 -1.75cm
∴Surface area - `4πr^2 - 4 × 22/7 × (3.5)/(2^2) - 38.5cm ^2`
APPEARS IN
संबंधित प्रश्न
A right circular cylinder just encloses a sphere of radius r (see figure). Find
- surface area of the sphere,
- curved surface area of the cylinder,
- ratio of the areas obtained in (i) and (ii).
On a map drawn to a scale of 1: 50,000, a rectangular plot of land ABCD has the following dimensions. AB = 6 cm; BC = 8 cm and all angles are right angles. Find:
1) the actual length of the diagonal distance AC of the plot in km.
2) the actual area of the plot in sq. km.
The volume of a sphere is 38808 cm3; find its diameter and the surface area.
A solid sphere of radius 15 cm is melted and recast into solid right circular cones of radius 2.5 cm and height 8 cm. Calculate the number of cones recast.
If a sphere of radius 2r has the same volume as that of a cone with circular base of radius r, then find the height of the cone.
The total surface area of a hemisphere of radius r is
If the surface area of a sphere is 144π m2, then its volume (in m3) is
If the surface area of a sphere is 2826 cm2 then find its volume. ( π= 3.14)
The radius of a sphere is 10 cm. If we increase the radius 5% then how many % will increase in volume?
The internal and external diameters of a hollow hemispherical vessel are 20 cm and 28 cm respectively. Find the cost to paint the vessel all over at ₹ 0.14 per cm2
