The formula for the circumference of the base of the tube and an example of the problem

Formula.co.id – After previously we discussed about formula for the perimeter of the pyramid this time we will discuss material about the formula for the circumference of the base of the 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 of the base tube.

Definition of Tube

Tube or cylinder is 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 the side of the base and the side of 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

Tube making frame:

• 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 the Tube Base

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

K = 2 x x r

Example of questions about the circumference of the tube base

1. A cylinder is known to have a radius of 7 cm. Find and count the circumference of the base of the tube!

Solution:

Is known:

• r = 7 cm

asked: K = …?

Answer:

• K = 2 x x r
• K = 2 x 22/7 x 7
• K = 308/7
• K = 44 cm

So, The circumference of the base of the cylinder is = 44 cm

2. There is a tube that is known to have a radius of 14 cm. Find and count the circumference of the base of the tube!

Solution:

Is known:

• r = 14 cm

asked: K = …?

Answer:

• K = 2 x x r
• K = 2 x 22/7 x 14
• K = 616/7
• K = 88 cm

So, The circumference of the base of the cylinder is = 88 cm

3. There is a tube which is known to have a radius of 28 m. Find and count the circumference of the base of the tube!

Solution:

Is known:

• r = 28 m

asked: K = …?

Answer:

• K = 2 x x r
• K = 2 x 22/7 x 28
• K = 1.232/7
• K = 176 m

So, The circumference of the base of the cylinder is = 176 m

4. There is a tube that is known to have a radius of 17 cm. Find and count the circumference of the base of the tube!

Solution:

Is known:

• r = 17 cm

asked: K = …?

Answer:

• K = 2 x x r
• K = 2 x 3.14 x 17
• K = 106,76 cm

So, The circumference of the base of the cylinder is = 106,76 cm

5. There is a cylinder which is known to have a radius of 23 m. Find and count the circumference of the base of the tube!

Solution:

Is known:

• r = 23 m

asked: K = …?

Answer:

• K = 2 x x r
• K = 2 x 3.14 x 23
• K = 144.44 m

So, The circumference of the base of the cylinder is = 144,44 m

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:

• The formula for the perimeter of the base of the prism
• The formula for the perimeter of the base of a cube