# ALEX Lesson Plan Resources

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ALEX Lesson Plans
Subject: Mathematics (8 - 12)
Title: Proofs into Practice: The Pythagorean Theorem in the Real World
Description: The introduction of this lesson has students verifying the famous Pythagorean Theorem with a hands-on proof. Students will then apply the Theorem in one of two ways: by solving for the side lengths of a right triangle and by determining whether three side lengths could possibly form a right triangle. Finally, students will choose one of two real-life applicataions to explore, using the Pythagorean Theorem.

Subject: Mathematics (9 - 12)
Title: Geometric Mean and Indirect Measurement
Description: In this inquiry-based lesson, students will work in groups to gather measurements needed to approximate the height of a building. Students will discover how geometric mean can be used to find the lengths of missing sides of right triangles.  This lesson plan was created by exemplary Alabama Math Teachers through the AMSTI project.

Thinkfinity Lesson Plans
Subject: Mathematics
Title: The Triangle Inequality      Add Bookmark
Description: In this reproducible activity, from an Illuminations lesson, students investigate how three sides can be arranged to make both triangles and non-triangles.
Thinkfinity Partner: Illuminations

Subject: Mathematics
Title: Half Angle      Add Bookmark
Description: This student interactive, from an Illuminations lesson, allows students to find the incenter of a triangle and see a visual explanation of why it occurs where it does.
Thinkfinity Partner: Illuminations

Subject: Mathematics
Title: IGD: Area of a Triangle       Add Bookmark
Description: This student interactive, from Illuminations, helps students understand and investigate how to find the area of a triangle by finding a way to make it look like a simpler shap--one whose area formula is known. Students make a copy of the triangle, and then make a parallelogram using the triangle and its copy. Students then determine that the area of the triangle is one-half that of the parallelogram.
Thinkfinity Partner: Illuminations

Subject: Mathematics
Title: IGD: Median      Add Bookmark
Description: This student interactive, from Illuminations, helps students understand and investigate the median of a triangle. Students read a definition and then use the interactive tool to manipulate and explore the properties of triangle medians by changing the shape of a triangle.
Thinkfinity Partner: Illuminations

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

Subject: Mathematics
Title: Inequalities in Triangles       Add Bookmark
Description: In this Illuminations lesson, students use pasta to create models of triangles and non-triangles in order to investigate the relationship between the longest side of the triangle and the sum of the other two sides of the triangle. In addition, students measure the sides and angles of a scalene triangle and investigate the relationship between the location of the largest angle and largest side in a triangle. There are also links to online activity sheets.
Thinkfinity Partner: Illuminations

Subject: Mathematics
Title: Isosceles Triangle Investigation       Add Bookmark
Description: This student interactive, from an Illuminations lesson, allows students to investigate the relationship between the area of the triangle and the length of its base.
Thinkfinity Partner: Illuminations

Subject: Mathematics
Title: Pieces of Proof      Add Bookmark
Description: This lesson offers an intermediate step of putting together the statements and reasons to build a formal geometry proof. There is a leap to be made from understanding postulates and theorems in geometry to writing proofs using them. Students are given the parts of the proof and have to put them in a correct order, like a puzzle, rather than starting with a blank page to generate the statements and reasons themselves.
Thinkfinity Partner: Illuminations

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