Question

the diameter of a cylinder is 28cm and it's height is 40cm .find the curved surface area and total surface area of the cylinder​

Answer 1

It is given that

Diameter of a cylinder = 28cm

We know that radius = diameter/2 = 28/2 = 14cm

Height of a cylinder = 40cm

We know that

Curved surface area = 2 πrh

By substituting the values

Curved surface area = 2 × (22/7) × 14 × 40

So we get

Curved surface area = 3520 cm2

We know that

Total surface area = 2 πrh + 2 πr2

By substituting the values

Total surface area = (2 × (22/7) × 14 × 40) + (2 × (22/7) × 142)

On further calculation

Total surface area = 3520 + 1232 = 4752 cm2

We know that Volume of cylinder = πr2h

By substituting the values

Volume of cylinder = (22/7) × 142 × 40

So we get

Volume of cylinder = 24640 cm3

Therefore, the curved surface area, total surface area and the volume of cylinder are 3520 cm2, 4752 cm2 and 24640cm3

Answer 2

Answer:

d=28 cm

therefore r=14cm

h=40

curved surface area = 2pirh

=2*22/7*14*40

=3250cm^2

total surface area=2pir(h+r)

=2*22/7*14(40+14)

=4752cm^2

hope it helps

Step-by-step explanation: