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Solids of revolution. Cylinder

Source: licencja: CC 0.

Bryły obrotowe. Walec

Learning objectives

  • You will get to know the method of obtaining solids of revolution and elements of the cylinder and the net of the cylinder.

Learning effect

  • You will learn to use the method of obtaining solids of revolution and to indicate elements of a cylinder and the net of the cylinder.

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nagranie abstraktu

What did you learn about the cylindercylindercylinder in the primary school?

The aim of the class is to get to know solids of revolution and increase your knowledge about the cylindercylindercylinder. Analyze the method of obtaining a certain type of solids. Draw a conclusion.

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Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Conclusion:

  • A solid of revolution is obtained by rotating a given plane figure around a straight line, known as the axis of revolution.

  • Give examples of solids of revolution that you know from everyday life.

  • Analyze the method of obtaining a cylindercylindercylinder. Make the definition of the cylinder.

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Aplet geogebra: Bryły obrotowe. Walec. Poniżej znajduje się galeria będąca wersją alternatywną dla aplikacji.
Source: GroMar, licencja: CC BY 3.0.
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Aplet geogebra: Bryły obrotowe. Walec. Poniżej znajduje się galeria będąca wersją alternatywną dla aplikacji.
Source: GroMar, licencja: CC BY 3.0.
Cylinder
Definition: Cylinder
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nagranie abstraktu

cylindercylindercylinder is a solid obtained by rotating a rectangle around a line including one of its sides.

Use your knowledge to solve the problems.

Task 1
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nagranie abstraktu

Draw a cylindercylindercylinder of height 5 cm and base radius 3 cm.

Task 2
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Draw a cylindercylindercylinder obtained by rotating a rectangle, whose sides are 4 cm and 6 cm, around its shorter side. Find out more about the net of a cylindercylindercylinder using your computer or other available sources.

Task 3
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Draw a net of a cylindercylindercylinder with a base radius 3 cm and height 8 cm. The diagram below will help you. Describe the way you draw the net of a cylinder.

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Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

The net of the cylindernet of the cylindernet of the cylinder

The net of the cylindernet of the cylindernet of the cylinder consists of two congruent circles and a rectangle. The radius of each of the circles equals the base radius of the cylinderradius of the cylinderradius of the cylinder. The perpendicular sides of the rectangle equal respectively the height of the cylindercylindercylinder and the circumference of the circle at its base.

Use your knowledge to do the tasks.

Task 4
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Can you roll a sheet of paper that you can see in the diagram so as to obtain a tube with a height of 10 cm and a base radius of 7 cm?

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Source: GroMar, licencja: CC BY 3.0.
Task 5
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The curved surface area of a cylindercylindercylinder unfolded on a plane is a rectangle whose one side is three times longer than the other and the diagonal has a length of 3610 cm. What is the height of this cylindercylindercylinder?

Task 6
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The curved surface area of a cylindercylindercylinder unfolded on a plane is a square whose side is 6π. Calculate the base radius of the cylinderradius of the cylinderradius of the cylinder.

Task 7
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Prove that the sections of a cylindercylindercylinder made by planes parallel to the axial section of the cylinderaxial section of the cylinderaxial section of the cylinder which are equally spaced form this section are the same.

Task 8
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An extra task

Square ABCD with a side of 5 cm has been rotated around a line parallel to side AD and spaced from it by 3 cm. Draw a figure obtained in this way. Give the length of the inner radius and the outer radius of the obtained solid.

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Having finished all the tasks, do the following consolidation tasks.

Remember:

  • A solid of revolution is obtained by rotation of a given plane figure around a line called an axis of revolution.

  • cylindercylindercylinder is a solid obtained by rotation of a rectangle around a line including one of its sides.

Exercises

Exercise 1
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Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. The diagonal of the axial section is inclined at α=75° to the base plane. The radius of the cylinder is 4. The height of the cylinder is longer than 30., 2. The curved surface area of a cylinder unfolded on a plane is a rectangle. The longer side of the rectangle is the height of the cylinder. The diagonal of the rectangle, whose length is 10 cm, and the longer side of the rectangle make an angle of 30°. The length of the radius of the cylinder is 52π., 3. The axial section of a cylinder is a square whose area is 225 cm2. The height of the cylinder is 15 cm.
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

The axial section of a cylinder is a rectangle sized 20 cm x 12 cm. Find the angle α between the diagonal of this section and the base plane of the cylinder (the calculation should be made to the accuracy of 1°).

Exercise 3
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Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. bryły obrotowe - solids of revolution, 2. walec - cylinder, 3. przekrój osiowy walca - axial section of the cylinder, 4. promień podstawy walca - base radius of the cylinder, 5. bryły obrotowe - radius of the cylinder, 6. promień walca - net of the cylinder
zadanie
Source: GroMar, licencja: CC BY 3.0.
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Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

axial section of the cylinder
axial section of the cylinder

przekrój osiowy walca

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wymowa w języku angielskim: axial section of the cylinder
cylinder
cylinder

walec

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wymowa w języku angielskim: cylinder
net of the cylinder
net of the cylinder

siatka walca

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wymowa w języku angielskim: net of the cylinder
radius of the cylinder
radius of the cylinder

promień walca

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wymowa w języku angielskim: radius of the cylinder
solids of revolution
solids of revolution

bryły obrotowe

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wymowa w języku angielskim: solids of revolution

Keywords

axial section of the cylinderaxial section of the cylinderaxial section of the cylinder

cylindercylindercylinder

net of the cylindernet of the cylindernet of the cylinder

radius of the cylinderradius of the cylinderradius of the cylinder

solids of revolutionsolids of revolutionsolids of revolution