Advertisements
Advertisements
Question
Find the surface area of a sphere of radius 5.6 cm.
`["Assume "pi=22/7]`
Advertisements
Solution
Radius(r) of sphere = 5.6 cm
Surface area of sphere = 4πr2
`=[4xx22/7xx(5.6)^2]cm^2`
= (88 × 0.8 × 5.6) cm2
= 394.24 cm2
Therefore, the surface area of a sphere having radius 5.6 cm is 394.24 cm2.
APPEARS IN
RELATED QUESTIONS
Find the radius of a sphere whose surface area is 154 cm2.
`["Assume "pi=22/7]`
Find the surface area of a sphere of diameter 21 cm.
Find the surface area of a sphere of diameter 3.5 cm.
The diameter of the moon is approximately one fourth of the diameter of the earth. Find the
ratio of their surface areas.
The volume of one sphere is 27 times that of another sphere. Calculate the ratio of their :
- radii,
- surface areas.
If the number of square centimeters on the surface of a sphere is equal to the number of cubic centimeters in its volume, what is the diameter of the sphere?
Find the maximum volume of a cone that can be carved out of a solid hemisphere of radius r cm.
A largest sphere is to be carved out of a right circular cylinder of radius 7 cm and height 14 cm. Find the volume of the sphere.
Find the radius of a sphere whose surface area is 154 cm2.
Find the volume of a sphere whose surface area is 154 cm2.
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.
If a hollow sphere of internal and external diameters 4 cm and 8 cm respectively melted into a cone of base diameter 8 cm, then find the height of the cone.
If the ratio of volumes of two spheres is 1 : 8, then the ratio of their surface areas is
Find the surface area and volume of sphere of the following radius. (π = 3.14)
4 cm
If the radius of a solid hemisphere is 5 cm, then find its curved surface area and total surface area. ( π = 3.14 )
From a rectangular solid of metal 42 cm by 30 cm by 20 cm, a conical cavity of diameter 14 cm and depth 24 cm is drilled out. Find: the weight of the material drilled out if it weighs 7 gm per cm3.
There is surface area and volume of a sphere equal, find the radius of sphere.
A spherical cannon ball, 28 cm in diameter is melted and recast into a right circular conical mould, the base of which is 35 cm in diameter. Find the height of the cone, correct to one place of decimal.
A spherical ball of radius 3 cm is melted and recast into three spherical balls. The radii of two of the balls are 1.5 cm and 2 cm. Find the diameter of the third ball.
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?
