ALEX Lesson Plans
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Title: Mirror, Mirror on the Wall: Reflections of Light
Description:
Students will learn about the reflective behaviors of light, and the wave and particle nature of light. Students will also recognize congruency of angles.
Standard(s): [MA2013] (8) 16: Verify experimentally the properties of rotations, reflections, and translations: [8G1] [MA2013] (8) 17: Understand that a twodimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them. [8G2] [MA2013] (8) 19: Understand that a twodimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar twodimensional figures, describe a sequence that exhibits the similarity between them. [8G4] [MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. [8G5] [S1] (8) 1: Identify steps within the scientific process. [S1] (8) 12: Classify waves as mechanical or electromagnetic.
Subject: Mathematics (8), or Science (8)
Title: Mirror, Mirror on the Wall: Reflections of Light
Description: Students will learn about the reflective behaviors of light, and the wave and particle nature of light. Students will also recognize congruency of angles.
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Title: Build a City on Geometry
Description:
The students will be split into small, cooperative groups and build a city following specific guidelines. The students will learn how a city is constructed with angles, intersections, parallel, intersecting, and transversal streets. They will understand that buildings are located at particular points which are considered alternate interior or exterior angles, corresponding angles, etc. This lesson plan was created as a result of the Girls Engaged in Math and Science, GEMS Project funded by the Malone Family Foundation.
Standard(s): [MA2013] (7) 15: Use facts about supplementary, complementary, vertical, and adjacent angles in a multistep problem to write and solve simple equations for an unknown angle in a figure. [7G5] [MA2013] (7) 16: Solve realworld and mathematical problems involving area, volume, and surface area of two and threedimensional objects composed of triangles, quadrilaterals, polygons, cubes, and right prisms. [7G6] [MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. [8G5]
Subject: Mathematics (7  8)
Title: Build a City on Geometry
Description: The students will be split into small, cooperative groups and build a city following specific guidelines. The students will learn how a city is constructed with angles, intersections, parallel, intersecting, and transversal streets. They will understand that buildings are located at particular points which are considered alternate interior or exterior angles, corresponding angles, etc. This lesson plan was created as a result of the Girls Engaged in Math and Science, GEMS Project funded by the Malone Family Foundation.
Web Resources
Lesson Plans
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Title: Adding It All Up
Description:
In this lesson, students draw various polygons and investigate their interior angles. The investigation is done using both an interactive tool and paper and pencil to foster an understanding of how different patterns can lead to the same solution. After comparing results with a partner, students develop a formula showing the relationship between the number of sides of a polygon and the sum of the interior angles.
Standard(s): [MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. [8G5]
Adding It All Up
http://illuminations...
In this lesson, students draw various polygons and investigate their interior angles. The investigation is done using both an interactive tool and paper and pencil to foster an understanding of how different patterns can lead to the same solution. After comparing results with a partner, students develop a formula showing the relationship between the number of sides of a polygon and the sum of the interior angles.
Interactives/Games
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Title: Math Makes a Connection: Exploring Angle Sums
Description:
In this interactive game, students will explore the sum of the measures of the interior angles of triangles, quadrilaterals, and other polygons using rotations of 180 degrees about a midpoint of a side. This game is part of the Connected Math site.
Standard(s): [MA2013] (7) 12: Draw (freehand, with ruler and protractor, and with technology) geometric shapes with given conditions. Focus on constructing triangles from three measures of angles or sides, noticing when the conditions determine a unique triangle, more than one triangle, or no triangle. [7G2] [MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. [8G5]
Math Makes a Connection: Exploring Angle Sums
http://connectedmath...
In this interactive game, students will explore the sum of the measures of the interior angles of triangles, quadrilaterals, and other polygons using rotations of 180 degrees about a midpoint of a side. This game is part of the Connected Math site.
Thinkfinity Learning Activities
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Title: Angle Sums
Description:
In this student interactive, from Illuminations, students explore the sum of the interior angles of triangles, quadrilaterals and other polygons. They can select which type of shape to explore; and, for triangles and quadrilaterals, they can watch a visual demonstration
Standard(s): [MA2013] (8) 20: Use informal arguments to establish facts about the angle sum and exterior angle of triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. [8G5]
Subject: Mathematics Title: Angle Sums
Description: In this student interactive, from Illuminations, students explore the sum of the interior angles of triangles, quadrilaterals and other polygons. They can select which type of shape to explore; and, for triangles and quadrilaterals, they can watch a visual demonstration Thinkfinity Partner: Illuminations Grade Span: 6,7,8

