The formula for the circumference of a cylinder with examples of the problem

Formula.co.id – After previously we discussed about perimeter of a rhombus this time we will discuss the material about the formula for the circumference of a tube, we will describe in detail and complete the meaning of the tube, properties of tubes, types, tubular objects, making tube nets, formulas, and examples of problems from the circumference tube.

Definition of Tube

Tube or cylinderis a three-dimensional figure formed by two identical parallel circles and a rectangle that also surrounds the two circles. The tube has 3 sides and also 2 ribs.

Tube Properties

Tubes have certain properties, namely as follows:

• The bottom and top tubes are circular in shape and have the same size.
• It has 3 sides, namely the base, the roof and the blanket.
• Has no corner points.
• The tube has 2 ribs, namely the one around the base and the top.

Tube Types

Tubes also have certain types, namely, including:

• Closed tube
  A closed tube is a tube in which the entire plane or sides are closed,
• open tube
  An open tube is a tube in which one of the sides of the base or the side of the roof is open or even both between the base and the roof are open.

Objects in everyday life in the form of a tube

In everyday life we ​​encounter many objects that are also in the form of tubes. In fact, we often use these objects both as equipment and as toys. For example: glasses, milk cans, drums, bottles, flutes, paralon pipes, gas cylinders, and so on.

Making Nets - Tube Nets

• Blanket tube in the form of a rectangle with length = circumference of the base of the tube = 2πr and width = height of the tube = t:
• Two circles of radius r.

Circumference of a Tube

The formula for the circumference of a cylinder is as follows:

K = 2 (p + t)

Example of questions about the circumference of the tube

1. There is a cylindrical glass which has a length of 4.71 cm and a height of 3.5 cm. Find and count the circumference of the glass!

Solution:

Is known:

• p = 4.71 cm
• t = 3.5

asked: K = …?

Answer:

• K = 2 (p + t)
• K = 2 (4.71 + 3.5)
• K = 2 (8.21)
• K = 16,42 cm

So, The circumference of the cylindrical glass is = 16,42 cm

2. There is a cylindrical milk can which is 3.63 cm long and 2.5 cm high. Find and count the circumference of the milk can!

Solution:

Is known:

• p = 3.63 cm
• t = 2.5

asked: K = …?

Answer:

• K = 2 (p + t)
• K = 2 (3.63 + 2.5)
• K = 2 (6.13)
• K = 12,26 cm

So, The circumference of the cylindrical milk can is = 12,26 cm

3. There is a cylindrical bottle that has a length of 6.21 cm and a height of 7.5 cm. find and count the circumference of the bottle!

Solution:

Is known:

• p = 6.21 cm
• t = 7.5

asked: K = …?

Answer:

• K = 2 (p + t)
• K = 2 (6.21 + 7.5)
• K = 2 (13.71)
• K = 27,42 cm

So, The circumference of the cylindrical bottle is = 27,42 cm

4. There is a cylindrical drum that is 8.63 cm long and 5.5 cm high. Find and count the circumference of the glass!

Solution:

Is known:

• p = 8.63 cm
• t = 5.5

asked: K = …?

Answer:

• K = 2 (p + t)
• K = 2 (8.63 + 5.5)
• K = 2 (14.13)
• K = 28,26 cm

So, The circumference of the cylindrical drum is = 28,26 cm

5. There is a cylindrical paralon pipe which has a length of 2.91 cm and a height of 1.5 cm. Find and count the circumference of the glass!

Solution:

Is known:

• p = 2.91 cm
• t = 1.5

asked: K = …?

Answer:

• K = 2 (p + t)
• K = 2 (2.91 + 2.5)
• K = 2 (5.41)
• K = 10,82 cm

So, The perimeter of the cylindrical paralon pipe is = 10,82 cm

This is a complete discussion of how to calculate the formula for the circumference of a tube along with examples of questions and their discussion, hopefully it will be useful…

Related Formulas:

• Rectangle Area Formula
• Trapezoid Area Formula