Question

Hi ❗❗
I will mark as brain list ✌✌➡️➡️
Please tell me answer of this question in easy way but Step-by-step explanation ✔️✔️

⚪⚪⚪⚪⚫⚫⚫⚫
⭕if the radius of the base of a cylinder is 2.8 cm and its height is 5.5 cm. find its curved surface area and total surface area❓❓ ☺️☺️​

Answer 1

A=2πrh+2πr^2=

2·π·2.8·5.5+2·π·(2.8)^2

≈

146.02123cm²

Answer 2

Answer:

Given :

radius of the cylinder ( r ) = 2.8 cm .

height of the cylinder ( h ) = 5.5 cm .

The curved surface area of a cylinder is given by the formula :

C.S.A = 2 π r h

↪ Curved Surface Area = 2 π r h

⇒ Curved Surface Area = 2 × 22/7 × 2.8 cm × 5.5 cm

⇒ Curved Surface Area = 2 × 22/7 × 28/10 cm × 5.5 cm

⇒ Curved Surface Area = 2 × 22 × 4/10 × 5.5 cm²

⇒ Curved Surface Area = 44 × 4/10 × 55/10 cm²

⇒ Curved Surface Area = 176/10 × 55/10 cm²

⇒ Curved Surface Area = 17.6 × 5.5 cm²

⇒ Curved Surface Area = 96.8 cm² .

The curved surface area of the cylinder is 96.8 cm² .

↪ Total surface area= 2 π r ( r + h )

⇒ Total surface area = 2 π r² + 2 π r h

⇒ Total surface area = 2 π r² + 96.8 cm²

⇒ Total surface area = 2 × 22/7 × ( 2.8 cm )² + 96.8 cm²

⇒ Total surface area = 44/7 × 7.84 cm² + 96.8 cm²

⇒ Total surface area = 44 × 1.12 cm² + 96.8 cm²

⇒ Total surface area = 49.28 cm² + 96.8 cm²

⇒ Total surface area = 146.08 cm²

The total surface area of the cylinder is 146.08 cm² .

Step-by-step explanation:

↪ A cylinder has cross section of a circle .

↪ The solution is made short by adding the curved surface are to the lateral surface area .

↪ The lateral surface area is the area of the curved surface of the cylinder .

↪ The total surface area includes the area of the two circles at each ends .