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The surface area and the volume of the cylinder

Source: licencja: CC 0.

Pole powierzchni i objętość walca

Learning objectives

You will develop the following competences: communication in English, mathematical, IT and basic scientific and technical competence, your learning skills.

You will get to know the method of calculating the surface area and volume of a cylinder using trigonometry.

Learning effect

  • You will learn how to calculate the surface area and volume of the cylinder using trigonometry.

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nagranie abstraktu

The aim of the class is calculating the surface areas and the volumes of cylinders. Remind all the information about cylinders that you have already acquired. Pay special attention to the formulas for calculating the surface areasurface areasurface area and the volume of the cylindervolume of the cylindervolume of the cylinder.

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nagranie abstraktu

The formula for the surface areasurface areasurface area of the cylindercylindercylinder:

Pc=2·Pp+2·π·r·H

r – the base radius of the cylindercylindercylinder
H – the height of the cylinderheight of the cylinderheight of the cylinder

The formula for the volume of the cylindervolume of the cylindervolume of the cylinder:

V=π·r2·H
Task 1
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nagranie abstraktu

Analyse carefully the material presented in the applet. Pay attention to the subsequent stages of solving the problem.

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Aplikacja geogebra - Pole powierzchni i objętość walca. Poniżej znajduje się galeria będąca wersją alternatywną dla aplikacji.
Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Use the formulas to solve the tasks.

Task 2
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nagranie abstraktu

A rectangle sized 10 cm by 15 cm was first rotated around its longer side and then it was rotated around its shorter side. Do both the cylinders have the same volumevolumevolume and total surface areasurface areasurface area? Justify your answer.

Task 3
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nagranie abstraktu

The axial section of a cylindercylindercylinder is a rectangle whose diagonal is 15 cm and it makes an angle α with the height. Calculate the height of the cylinderheight of the cylinderheight of the cylinder and its base radius when you know that tgα=3.

Task 4
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nagranie abstraktu

The curved surface area of the cylindercurves surface area of the cylindercurved surface area of the cylinder unfolded on a plane is a rectangle. The longer side of this rectangle is the height of the cylinderheight of the cylinderheight of the cylinder. The diagonal of the rectangle is 18 cm and it makes an angle of 30° with the longer side of the rectangle. Calculate the volume of the cylindervolume of the cylindervolume of the cylinder.

Task 5
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nagranie abstraktu

Two cylinders are similar on the scale of k = 3. The sum of volumes of both cylinders equals 140·π. Calculate the volumevolumevolume of each of the cylinders. Justify your answer.

Task 6
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nagranie abstraktu

The sum of surface areas of both bases of a cylindercylindercylinder equals its curved surface areasurface areasurface area and measures 72·π cmIndeks górny 2. Calculate the height of the cylinderheight of the cylinderheight of the cylinder.

Task 7
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nagranie abstraktu

The inside diameter of each of the pipes that make a water supply system measures 3 inches (1 inch = 2,54 cm). In the water supply system there are about 510 l of water. Calculate what is the approximate length of the water supply system.

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nagranie abstraktu

Having solved all the tasks, sort the result numbers from the largest to the smallest.

Task 8
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nagranie abstraktu

The mass of a cylindercylindercylinder shaped rotor, whose diameter is 6 cm and the height 10 cm, equals 1,4 kg. Calculate the mass of 1 cmIndeks górny 3 of the alloy which was used to make the rotor.

Having finished, do the consolidation tasks.

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nagranie abstraktu
  • The total surface area of the cylindertotal surface area of the cylindertotal surface area of the cylinder equals the sum of the surface areas of its bases and the curved surface area.

  • The volume of the cylindervolume of the cylindervolume of the cylinder equals the product of the surface areasurface areasurface area of its base and its height.

Exercises

Exercise 1
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Wersja alternatywna ćwiczenia: The height of a cylinder is 7. The axial section of this cylinder is a rectangle whose diagonal is 9. So, the surface area of the base equals: Możliwe odpowiedzi: 1. , 2. , 3. 32π, 4. 16π
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

How much metal sheet do you need to make a cylinder shaped can whose base radius is 3 cm and the height 5 cm? Add extra 4% of the metal sheet surface for waste.

Exercise 3

The diameter of the base of the cylinder is 8 cm long and its height is 15 cm. Describe in English how to calculate the volume of this cylinder.

Exercise 4
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Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. walec - cylinder, 2. podstawa walca - base of the cylinder, 3. wysokość walca - height of the cylinder, 4. objętość walca - volume of the cylinder, 5. przekrój osiowy walca - curved surface area of the cylinder, 6. przekątna przekroju osiowego walca - axial section 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
base of the cylinder
base of the cylinder

podstawa walca

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wymowa w języku angielskim: base of the cylinder
curves surface area of the cylinder
curves surface area of the cylinder

powierzchnia boczna walca

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wymowa w języku angielskim: curves surface area of the cylinder
cylinder
cylinder

walec

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

przekątna przekroju osiowego walca

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

wysokość walca

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wymowa w języku angielskim: height of the cylinder
surface area
surface area

pole powierzchni

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wymowa w języku angielskim: surface area
total surface area of the cylinder
total surface area of the cylinder

pole powierzchni całkowitej walca

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wymowa w języku angielskim: total surface area of the cylinder
volume
volume

objętość

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

objętość walca

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wymowa w języku angielskim: volume of the cylinder

Keywords

base of the cylinderbase of the cylinderbase of the cylinder

cylindercylindercylinder

height of the cylinderheight of the cylinderheight of the cylinder

total surface area of the cylindertotal surface area of the cylindertotal surface area of the cylinder

volume of the cylindervolume of the cylindervolume of the cylinder