ALEX Lesson Plans
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Title: You can die now or "dilate R to R'"
Description:
This lesson will teach students to not only create a dilation, but also assist them in understanding the relationship of similarity between a figure and its image through a dilation. Students will use an online math tool to adjust the location of the point of dilation, and they will find the scale factor changes when the point of dilation moves. Students will also find that parallel lines can be used to create a dilation.
Standard(s): [MA2013] GEO (912) 14: Verify experimentally the properties of dilations given by a center and a scale factor. [GSRT1]
Subject: Mathematics (9  12)
Title: You can die now or "dilate R to R'"
Description: This lesson will teach students to not only create a dilation, but also assist them in understanding the relationship of similarity between a figure and its image through a dilation. Students will use an online math tool to adjust the location of the point of dilation, and they will find the scale factor changes when the point of dilation moves. Students will also find that parallel lines can be used to create a dilation.
Thinkfinity Lesson Plans
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Title: Symmetries I
Description:
In this unit of four lessons, from Illuminations, investigate rotational symmetry. They learn about the mathematical properties of rotations and have an opportunity to make their own designs.
Standard(s): [MA2013] GEO (912) 14: Verify experimentally the properties of dilations given by a center and a scale factor. [GSRT1]
Subject: Mathematics Title: Symmetries I
Description: In this unit of four lessons, from Illuminations, investigate rotational symmetry. They learn about the mathematical properties of rotations and have an opportunity to make their own designs. Thinkfinity Partner: Illuminations Grade Span: 9,10,11,12
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Title: Symmetries II
Description:
In this unit of four lessons, from Illuminations, students use Java applets to investigate reflection, mirror, or bilateral symmetry. They learn about the mathematical properties of mirror symmetry and have a chance to create designs with mirror symmetry.
Standard(s): [MA2013] GEO (912) 16: Use the properties of similarity transformations to establish the angleangle (AA) criterion for two triangles to be similar. [GSRT3]
Subject: Mathematics Title: Symmetries II
Description: In this unit of four lessons, from Illuminations, students use Java applets to investigate reflection, mirror, or bilateral symmetry. They learn about the mathematical properties of mirror symmetry and have a chance to create designs with mirror symmetry. Thinkfinity Partner: Illuminations Grade Span: 9,10,11,12
Thinkfinity Learning Activities
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Title: Scale Factor
Description:
This student interactive, from Illuminations, allows the user to investigate the changes in area and perimeter when the side length is doubled, tripled, or quadrupled.
Standard(s): [MA2013] ALC (912) 11: Use ratios of perimeters, areas, and volumes of similar figures to solve applied problems. (Alabama)
Subject: Mathematics Title: Scale Factor
Description: This student interactive, from Illuminations, allows the user to investigate the changes in area and perimeter when the side length is doubled, tripled, or quadrupled. Thinkfinity Partner: Illuminations Grade Span: 6,7,8,9,10,11,12
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Title: Square Graphs
Description:
This student interactive, from an Illuminations lesson, allows students to view six different graphs. Each graph plots one characteristic of the square along the horizontal axis and another along the vertical axis. Students then determine which two characteristics are used to make each graph.
Standard(s): [MA2013] GEO (912) 14: Verify experimentally the properties of dilations given by a center and a scale factor. [GSRT1]
Subject: Mathematics Title: Square Graphs
Description: This student interactive, from an Illuminations lesson, allows students to view six different graphs. Each graph plots one characteristic of the square along the horizontal axis and another along the vertical axis. Students then determine which two characteristics are used to make each graph. Thinkfinity Partner: Illuminations Grade Span: 9,10,11,12

