Topicmc1f5f8ed1291d575_1528449000663_0Topic

PyramidpyramidPyramid and its properties

Levelmc1f5f8ed1291d575_1528449084556_0Level

Third

Core curriculummc1f5f8ed1291d575_1528449076687_0Core curriculum

X. Solid geometry (stereometry). The Student:

3. recognizes, in prisms and pyramids, angles between line segments (e.g. edges and edges or edges and diagonals); angles between faces; calculates the measures of these angles;

6. calculates the volume and surface area of prisms, pyramids, cylinder, cone, sphere, also using trigonometry and theorems learned;

7. uses dependencies between volumes of similar solids.

Timingmc1f5f8ed1291d575_1528449068082_0Timing

45 minutes

General objectivemc1f5f8ed1291d575_1528449523725_0General objective

Interpreting and manipulating information presented in the text, both mathematical and popular science, as well as in the form of graphs, diagrams, tables.

Specific objectivesmc1f5f8ed1291d575_1528449552113_0Specific objectives

1. Communicating in English, developing competences in mathematics, science, technology and IT, developing learning skills.

2. Identifying the types of pyramids.

3. Pointing elements of a pyramidpyramidpyramid, line segments and angles in a pyramid.

Learning outcomesmc1f5f8ed1291d575_1528450430307_0Learning outcomes

The student:

- identifies the types of pyramids,

- points the elements of the pyramidpyramidpyramid.

Methodsmc1f5f8ed1291d575_1528449534267_0Methods

1. Diamond ranking.

2. Situational analysis.

Forms of workmc1f5f8ed1291d575_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionmc1f5f8ed1291d575_1528450127855_0Introduction

Using the diamond ranking method students organize their knowledge about relative position of two planes, the relative position of two lines in space and the relative position of the straight line and the plane.

They present the effects of their work; the teacher verifies the information provided and clarifies students’ doubts.

Proceduremc1f5f8ed1291d575_1528446435040_0Procedure

The teacher informs students that the aim of the lesson is to learn about the properties of the pyramidpyramidpyramid.

Students working in groups analyze the material presented in the applet. They make hypotheses. They formulate conclusions.

Task
Analyze the material contained in the applet. Formulate the definition of a pyramid.

[Geogebra applet]

Definition
A pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base.mc1f5f8ed1291d575_1527752256679_0A pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base.

Students, working independently, determine the relationship between the type of the n‑sides of the base and the number of faces, vertices and edges of the pyramidpyramidpyramid. They formulate appropriate conclusions.

Task
The basebasebase of the pyramid is the n‑sided polygon. Identify the relationship between the number n and the number of vertices, edges and faces of the pyramid.

Conclusion:

pyramidpyramidpyramid with an n‑sided basebasebase has:

- n + 1 vertices,

- n + 1 faces, and

- 2n edges.

Students, working independently, formulate definitions of pyramidpyramidpyramid types.

Definition
The pyramid is called a right one if all its lateral edges have the same length.

Definition
The pyramid is the regular pyramidregular pyramidregular pyramid if its basebasebase is a regular polygon.

Definition
The trigonal or triangular pyramid with all equilateral triangle faces is the regular tetrahedron.mc1f5f8ed1291d575_1527712094602_0The trigonal or triangular pyramid with all equilateral triangle faces is the regular tetrahedron.

Using the definitions students solve the problems.

Task
In a pyramidpyramidpyramid, the number of faces is 7 less than the number of edges. Calculate how many vertices this pyramid has.

Task
In the regular quadrangular pyramid the length of the base edge is equal to 4 dm, and the side edgeedgeedge length is 6 dm. Calculate the heightheightheight of this pyramidpyramidpyramid.

Task
In the regular triangular pyramid the edgeedgeedge of the basebasebase is 10 dm long, the side edge is 8 dm. Calculate the height of this pyramid.

Task
Calculate the measure of the dihedral angle at the base of the regular triangular pyramidpyramidpyramid if the height of the pyramid is 3 times shorter than the heightheightheight of the basebasebase.

Task
The sum of the edgeedgeedge length of a regular tetrahedron is equal to 48 cm. Calculate the heightheightheight of this tetrahedron.

Task
The basebasebase of the right pyramidright pyramidright pyramid is a rectangle with sides of 8 cm and 10 cm. The side edgeheightedge length is 15 cm. Calculate the heights hIndeks dolny 1 and hIndeks dolny 2 of the two different side faces of this pyramidpyramidpyramid.

Task for volunteers
The base of the pyramid is the square, and the bottom of its heightheightheight is in one of the vertices of this square. Knowing that the height of the pyramidpyramidpyramid is equal to the diagonal of the base, calculate the cosine of the inclination angle of the longest side edge of the pyramid to the edgeedgeedge of the basebasebase.

Lesson summarymc1f5f8ed1291d575_1528450119332_0Lesson summary

Students do the revision exercises. Together, they formulate definitions to remember:

- The pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base.mc1f5f8ed1291d575_1527752263647_0- The pyramid is a polyhedron formed by connecting a polygonal base and a point, called the apex. Each base edge and apex form a triangle, called a lateral face. It is a conic solid with polygonal base.- The pyramid is called a right one if all its lateral edges have the same length.
- The pyramid is the regular pyramid if its base is a regular polygon.
mc1f5f8ed1291d575_1527752263647_0- The pyramid is called a right one if all its lateral edges have the same length.
- The pyramid is the regular pyramid if its base is a regular polygon.

Selected words and expressions used in the lesson plan

angle of inclination of the lateral face to the baseangle of inclination of the lateral face to the baseangle of inclination of the lateral face to the base

apexapexapex

basebasebase

edgeedgeedge

heightheightheight

lateral edge of the pyramidlateral edge of the pyramidlateral edge of the pyramid

lateral face of the pyramidlateral face of the pyramidlateral face of the pyramid

pyramidpyramidpyramid

regular pyramidregular pyramidregular pyramid

right pyramidright pyramidright pyramid

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pyramid1
pyramid

ostrosłup

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wymowa w języku angielskim: pyramid
base1
base

podstawa (ostrosłupa)

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wymowa w języku angielskim: base
regular pyramid1
regular pyramid

ostrosłup prawidłowy

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wymowa w języku angielskim: regular pyramid
edge1
edge

krawędź

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wymowa w języku angielskim: edge
height1
height

wysokość (ostrosłupa)

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wymowa w języku angielskim: height
right pyramid1
right pyramid

ostrosłup prosty

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wymowa w języku angielskim: right pyramid
angle of inclination of the lateral face to the base1
angle of inclination of the lateral face to the base

kąt nachylenia ściany bocznej ostrosłupa do podstawy

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wymowa w języku angielskim: angle of inclination of the lateral face to the base
apex1
apex

wierzchołek (ostrosłupa)

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wymowa w języku angielskim: apex
lateral edge of the pyramid1
lateral edge of the pyramid

krawędź boczna ostrosłupa

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wymowa w języku angielskim: lateral edge of the pyramid
lateral face of the pyramid1
lateral face of the pyramid

ściana boczna ostrosłupa

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wymowa w języku angielskim: lateral face of the pyramid