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ALEX Lesson Plans


Subject: Mathematics (9 - 12)
Title: Construct This!
Description: Students will construct equilateral triangles, squares, and regular hexagons inscribed in circles using the free GeoGebra computer program.


Thinkfinity Lesson Plans


Subject: Mathematics
Title: IGD: Simson Line      Add Bookmark
Description: This student interactive, from Illuminations, helps students understand and investigate a triangle s Simson line, which is the line passing through the feet of the perpendiculars dropped from P to the three sides of a triangle. Students construct the Simson line for a given triangle using the interactive applet.
Thinkfinity Partner: Illuminations
Grade Span: 9,10,11,12



Subject: Mathematics
Title: Triangle Classification      Add Bookmark
Description: This student interactive, from an Illuminations lesson, allows students to turn a segment into a right triangle, an isosceles triangle, and an obtuse triangle.
Thinkfinity Partner: Illuminations
Grade Span: 9,10,11,12



Subject: Mathematics
Title: All in the Family       Add Bookmark
Description: In this Illuminations lesson, students use a dynamic geometry applet to conjecture about the relationships between characteristics of a square: side length, diagonal length, perimeter, and area. Students use graphs to represent functional relationships between two characteristics, such as diagonal length as a function of perimeter. In addition, there are links to online activities, reproducibles, and other related resources.
Thinkfinity Partner: Illuminations
Grade Span: 9,10,11,12



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