Advertisements
Advertisements
рдкреНрд░рд╢реНрди
Find the total surface area of a hemisphere and a solid hemisphere each of radius 10 cm.
(Use ЁЭЬЛ = 3.14)
Advertisements
рдЙрддреНрддрд░
The surface area of the hemisphere = `2πr^2`
- `2 × 3.14 × (10)^2`
- `628 cm^2`
The surface area of solid hemisphere =` 3πr^2`
- `3 × 3.14 × (10)^2`
-`942 cm^2`
APPEARS IN
рд╕рдВрдмрдВрдзрд┐рдд рдкреНрд░рд╢реНтАНрди
Find the surface area of a sphere of diameter 21 cm.
`["Assume "pi=22/7]`
Find the surface area of a sphere of diameter 3.5 m.
`["Assume "pi=22/7]`
Find the surface area of a sphere of radius 5.6 cm.
The surface area of a sphere is 5544 `cm^2`, find its diameter.
The diameter of the moon is approximately one fourth of the diameter of the earth. Find the
ratio of their surface areas.
A spherical ball of lead has been melted and made into identical smaller balls with radius equal to half the radius of the original one. How many such balls can be made?
A hemi-spherical bowl has negligible thickness and the length of its circumference is 198 cm. Find the capacity of the bowl.
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 surface area of a sphere of radius 5 cm is five times the area of the curved surface of a cone of radius 4 cm. Find the height of the cone.
If a sphere is inscribed in a cube, find the ratio of the volume of cube to the volume of the sphere.
A cylindrical rod whose height is 8 times of its radius is melted and recast into spherical balls of same radius. The number of balls will be
A cone and a hemisphere have equal bases and equal volumes the ratio of their heights is
The given figure shows the cross-section of a cone, a cylinder and a hemisphere all with the same diameter 10 cm and the other dimensions are as shown.

Calculate :
- the total surface area.
- the total volume of the solid and
- the density of the material if its total weight is 1.7 kg.
A conical tent is to accommodate 77 persons. Each person must have 16 m3 of air to breathe. Given the radius of the tent as 7 m, find the height of the tent and also its curved surface area.
There is a ratio 1: 4 between the surface area of two spheres, find the ratio between their radius.
A vessel is in he form of an inverted cone. Its height is 11 cm., and the radius of its top which is open is 2.5 cm. It is filled with water up to the rim. When lead shots, each of which is a sphere of radius 0.25 cm., are dropped 2 into the vessel, `2/5`th of the water flows out. Find the number of lead shots dropped into the vessel.
The radius of a sphere increases by 25%. Find the percentage increase in its surface area
A solid sphere is cut into two identical hemispheres.
Statement 1: The total volume of two hemispheres is equal to the volume of the original sphere.
Statement 2: The total surface area of two hemispheres together is equal to the surface area of the original sphere.
Which of the following is valid?
