Topicm1dadd405c24ac8ce_1528449000663_0Topic

Solids of revolution. Cylinder

Levelm1dadd405c24ac8ce_1528449084556_0Level

Third

Core curriculumm1dadd405c24ac8ce_1528449076687_0Core curriculum

X. Solid geometry. The student:

4. recognizes an angle between segments and an angle between segments and planes in cylinders and cones (e.g. a line inclination angle, an angle between the element of the cylindrical surface and the base of the cone) and works out the sizes of these angles;

6. calculates the volume and the surface area of a prism, pyramid, cylinder, cone, sphere using trigonometry and theorems.

Timingm1dadd405c24ac8ce_1528449068082_0Timing

45 minutes

General objectivem1dadd405c24ac8ce_1528449523725_0General objective

Interpretation and the use of information presented both in a mathematical and popular science texts also using graphs, diagrams and tables.

Specific objectivesm1dadd405c24ac8ce_1528449552113_0Specific objectives

1. Communication in English, developing mathematical, IT and basic scientific and technical competence, developing learning skills.

2. Learning the method of obtaining solids of revolution.

3. Indicating elements of the cylinder and the net of the cylinder.

Learning outcomesm1dadd405c24ac8ce_1528450430307_0Learning outcomes

The student:

1. Learns the method of obtaining a solid of revolution.

2. Indicates elements of the cylinder and its net.

Methodsm1dadd405c24ac8ce_1528449534267_0Methods

1. Mind map.

2. Situation anaysis.

Forms of workm1dadd405c24ac8ce_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionm1dadd405c24ac8ce_1528450127855_0Introduction

Working in groups students make mind maps of all the information about cylinders that they previously acquired at primary school.

Students present the results of their work on posters. The teacher verifies the information and explains any doubts.

Procedurem1dadd405c24ac8ce_1528446435040_0Procedure

Working in groups students make mind maps of all the information about cylinders that they previously acquired at primary school.

Students present the results of their work on posters. The teacher verifies the information and explains any doubts.

The teacher tells the students that the aim of the class is to get to know solids of revolution and extend their knowledge about the cylindercylindercylinder.

Working in groups, students analyze the method of obtaining a certain type of solids and draw conclusions.

[Geogebra applet]

[Geogebra applet]

Conclusion

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

Students give examples of solids of revolution that they know from everyday life. They recognize the solids using models previously prepared by the teacher.

Working in groups, students analyze the method of obtaining a cylindercylindercylinder and make a definition of the cylindercylindercylinder.

The definition of the cylindercylindercylinder.

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

Students use the information to solve the problems.

Task

Draw a cylinder of height 5 cm and base radius 3 cm.m1dadd405c24ac8ce_1527752263647_0Draw a cylinder of height 5 cm and base radius 3 cm.

Task

Draw a cylindercylindercylinder obtained by rotating a rectangle, whose sides are 4 cm and 6 cm, around its shorter side.

Students work individually. They get to know the net of a cylindercylindercylinder using their computer.

Task

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 cylindercylindercylinder.

[Illustration]

The net of a cylindercylindercylinder

The net of a cylindercylindercylinder 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.

Students use their knowledge to do the task.

Task

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?m1dadd405c24ac8ce_1527752256679_0Can 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?

[Illustration]

Task

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 36√10 cm. What is the height of this cylindercylindercylinder?

Task

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

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.

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.

Lesson summarym1dadd405c24ac8ce_1528450119332_0Lesson summary

Students do the consolidation tasks. They work together to make definitions to be remembered.

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

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

Selected words and expressions used in the lesson plan

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

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cylinder1
cylinder

walec

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wymowa w języku angielskim: cylinder
radius of the cylinder1
radius of the cylinder

promień cylindra

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wymowa w języku angielskim: radius of the cylinder
axial section of the cylinder1
axial section of the cylinder

przekrój osiowy walca

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wymowa w języku angielskim: axial section of the cylinder
net of the cylinder1
net of the cylinder

siatka cylindra

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wymowa w języku angielskim: net of the cylinder
solids of revolution1
solids of revolution

bryły obrotowe

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wymowa w języku angielskim: solids of revolution