Q1.Find the curved surface area and total surface area of a cylinder of radius 21 cm qnd height 5 cm.
Answers
Explanation:
Given
Radius of Cyclinder is 21cm and height of the Cyclinder is 5cm
To Find
We have to find the curved surface area of cylinder and total surface area of the Cyclinder.
SOLUTION:
Formulas for finding CSA and TSA of cylinder
Curved surface area of Cyclinder=2πrh
Total surface area of Cyclinder=2πr(r+h)
Where , r is the radius; h is the height & π is a constant term.
Curved surface area of Cyclinder= 2πrh
Curved surface area of Cyclinder= 2×22/7×21×5
Curved surface area of Cyclinder=44/7×21×5
Curved surface area of Cyclinder=44×3×5
Curved surface area of Cyclinder=660cm²
Total surface area of Cyclinder= 2πr(r+h)
Total surface area of Cyclinder=2×22/7×21(21+5)
Total surface area of Cyclinder=44/7×21(26)
Total surface area of Cyclinder=44×3(26)
Total surface area of Cyclinder=44×78
Total surface area of Cyclinder=3432cm²
Extra information=>
Area should Always be written in sq.units.
Curved surface area is the total area from the bottom to the top of the Cyclinder to its outer boundary.
Total surface area is the total area bounded from the bottom to the top.