# We all see many cylindrical objects around us.

# A thermos flask, a cold-drink can and packets of biscuits, all are cylindrical shaped.

# These cylinders have two circular surfaces at the top and bottom of the cylinder.

# And between these two plain circular surfaces, we have a curved body of the cylinder.

# So, in a closed cylinder, we have three surface. Two circular and one covered.

# Now, Suppose if we want to gift a deodorant bottle which is in cylindrical shape to our friend so we need to wrap it up.

# If we want to spend the minimum of the paper required for the wrapping, we can cover the three surfaces separately.

# The top and bottom cover of the cylinder will be circular and we will require a rectangular sheet to cover the curved surface.

# Then the amount of paper required to cover this cylinder bottle will be equal to the surface area of the cylinder.

# Letâ€™s discuss the surface area of the cylinder.

# The surface area of the cylinder is consists of two types of surface. Plain circular and curved.

# If we have an open cylinder, all we have will be a curved surface.

# And the surface area of this curved surface is called the curved surface area.

# If we consider the surface area of both the circular surface along with the curved surface, it would be called the total surface area of the cylinder.

# Letâ€™s find the curved and total surface area of the cylinder.

# Letâ€™s take a closed cylinder with a base of radius say $r$ and let the height of the cylinder be $h$.

# The area of the top and bottom of the cylinder will be simply the area of the circles of radius $r$.

# Now, the lateral surface of the cylinder is curved upon these circular bases.

# So, the length of the rectangular sheet used to make this curved surface will be equal to the circumference of the bases.

# As the height of the cylinder is $h$, the area of the curved surface will be given by,

# So, the curved surface area of a cylinder is give by

# And the total surface area of the cylinder is given by

# A cylinder consists of three surface. Circular top, circular bottom and curved lateral surface.

# The lateral surface of the cylinder is made of a rectangular sheet and its area is given by.

# The total surface area of the cylinder and its curved surface area is given by