Advertisements
Advertisements
प्रश्न
In the example given below, the radius of the base of a cylinder and its height is given. Then find the curved surface area and total surface area.
r = 7 cm, h = 10 cm
उत्तर
We know that,
Curved surface area = 2πrh
Total surface area = 2πr(h + r)
Here, r = 7 cm, h = 10 cm
The curved surface area of a cylinder = 2πrh
= `2 xx 22/7 xx 7 xx 10`
= `44 xx 10`
= 440 cm2
Total surface area of a cylinder = 2πr(h + r)
= `2 xx 22/7 xx 7(10 + 7)`
= `44 xx 17`
= 748 cm2
संबंधित प्रश्न
The students of a Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition?
`["Assume "pi=22/7]`
The area of the base of a right circular cylinder is 616 cm2 and its height is 2.5 cm. Find the curved surface area of the cylinder.
Find the total surface area and whose height is 15 cm and the radius of the base is 7 cm.
A rectangular sheet of paper 30 cm × 18 cm can be transformed into the curved surface of a right circular cylinder in two ways i.e., either by rolling the paper along its length or by rolling it along its breadth. Find the ratio of the volumes of the two cylinders thus formed.
2.2 cubic dm of brass is to be drawn into a cylindrical wire 0.25 cm in diameter. Find the length of the wire.
The height of a right circular cylinder is 10.5 m. Three times the sum of the areas of its two circular faces is twice the area of the curved surface. Find the volume of the cylinder.
If the height of a cylinder is doubled, by what number must the radius of the base be multiplied so that the resulting cylinder has the same volume as the original cylinder?
A well with 6 m diameter is dug. The earth taken out of it is spread uniformly all around it to a width of 2 m to form an embankment of height 2.25 m. Find the depth of the well.
A cylindrical container with internal diameter of its base 20 cm, contains water upto a height of 14 cm. Find the area of the wet surface of the cylinder.
If the radius of a cylinder is doubled and its curved surface area is not changed, the height must be halved.
