[br][table][tr][td]Subject:[/td][td]Mathematics[/td][/tr][tr][td]Grade Level:[/td][td]6th / 7th[/td][/tr][tr][td]Duration:[/td][td]20-30 min[/td][/tr][tr][td]Technology:[/td][td]Computer/tablet for students, Computer and projector for teacher[/td][/tr][/table]

Similarity (of triangles)

The students understand similarity of figures and they can also explain the concept of similarity by means of triangles.

[b]Objectives[/b][br][list][*]The students understand the connection between similar triangles.[br][/*][*]The students know the properties of similar triangles and other similar figures.[br][/*][*]The students can decide if two figures are similar or not.[br][br][/*][/list][b]Assessment[/b][br]The students can control by themselves if they have achieved the learning outcomes by using worksheet three and four of the second chapter of this book.

The students can work alone or in groups of two on the computer and explore the worksheets for similarity independently. [br][br]Worksheet 1: [url=https://www.geogebra.org/m/fCZsjyyq]Similar Triangles[/url][br]The students should move points B and C and answer the questions below the applet.[br][br]Worksheet 2: [url=https://www.geogebra.org/m/PBvCDznB]Triangles are similar if...[/url][br]The students should drag the slider and add the missing words and numbers in the two sentences. If everything has been entered correctly, the confirmation message appears.[br][br]Worksheet 3: [url=https://www.geogebra.org/m/bsTbaw4P]Which Triangles are similar?[/url][br]This worksheet serves as a check whether the students have already understood the concept of similarity or not. [br][br]Worksheet 4: [url=https://www.geogebra.org/m/CSZUPAvw]Questions - Similar Figures / Triangles[/url][br]In the fourth worksheet the students can again apply their newly acquired knowledge and find the right conditions for similar figures.

The students need the computer or the tablet during the entire lesson. [br]No prior knowledge is necessary for working with the worksheets. [br]The verification of the learning outcomes can be done by using the last two worksheets on the computer.[br][br]Alternatively, this applet can also be shown by the teacher on the projector and the worksheets can be discussed together. In this case, however, an assessment of competences can not take place through the worksheets, since the questions are also discussed and answered in class.

Move the points B and C and watch the interior angles and the sides of the triangle.[br]Which connections can you find?