Advertisements
Advertisements
Question
Find the total surface area of a closed cylindrical drum if its diameter is 50 cm and height is 45 cm. (π = 3.14)
Solution
Diameter = 50 cm
Radius = 25 cm
Height = 45 cm
Total surface area = 2 π r (h + r )
= `2 xx 3.14 xx 25 (25 + 45)`
= 10990 sq cm
Thus, the total surface area of the closed cylinderical drum is 10990 sq cm.
RELATED QUESTIONS
The lateral surface area of a hollow cylinder is 4224 cm2. It is cut along its height and formed a rectangular sheet of width 33 cm. Find the perimeter of rectangular sheet?
The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find the cost of plastering its inner curved surface at Rs 4 per square metre.
The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete revolutions moving once over to level a playground. What is the area of the playground?
What length of a solid cylinder 2 cm in diameter must be taken to recast into a hollow cylinder of length 16 cm, external diameter 20 cm and thickness 2.5 mm?
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.
Water flows out through a circular pipe whose internal diameter is 2 cm, at the rate of 6 metres per second into a cylindrical tank. The radius of whose base is 60 cm. Find the rise in the level of water in 30 minutes?
Write the ratio of total surface area to the curved surface area of a cylinder of radius rand height h.
In a cylinder, if radius is halved and height is doubled, the volume will be ______.
The curved surface area of a cylinder is 198cm2 and its base has diameter 21cm. Find the height and the volume of the cylinder.
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 = 70 cm, h = 1.4 cm
