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 On Top of the World This interdisciplinary math lesson from Illuminations may be used in conjunction with geography education. Students will consider strategies for figuring out the distance to the horizon from various heights. A formula will be generated that may be used to determine this distance. The example of the height of Mount Everest is also used. This lesson is appropriate for grades 9-12 and should require... http://illuminations.nctm.org/Lesson.aspx?id=2493
 Squares On A Triangle This lesson will help students understand the law of cosines and the Pythagorean theorem. The material has students find out whether a triangle is acute, obtuse, or right; determine a formula for the law of cosines to relate the sides of any type of triangle, and explain how the Law of Cosines is an extension of the Pythagorean theorem. Student activity sheets are included. This material is... http://illuminations.nctm.org/Lesson.aspx?id=2517
 Triangle Classification This geometry lesson from Illuminations presents the Triangle Classification problem. Students will attempt to classify the triangles formed in a plane when a randomly selected point is connected to the endpoints of a given line segment. Students should have access to a computer with internet access for the lesson. The material is intended for grades 9-12 and should require 1 class period to... http://illuminations.nctm.org/Lesson.aspx?id=2195
 Maths Doctor: Shape and Space The Maths Doctor website from Macmillan Publishers contains more than 250 lessons that are free for anyone. Each lesson includes a three to five minute video tutorial on the topic and a related worksheet for the student to complete. Each worksheet has a convenient QR code that a student can scan to access the video. The Shape and Space section includes numerous lessons on topics ranging from... http://www.mathsdoctor.co.uk/resources/
 Law of Sines and Cosines This math unit from Illuminations includes two lessons which help to teach the Law of Sines and the Law of Cosines. The first lesson asks students to use right triangle trigonometry to develop the law of sines. The second lesson uses right triangle trigonometry and the Pythagorean theorem to develop the law of cosines. The materials are intended for grades 9-12 and should require 2 class periods... http://illuminations.nctm.org/unit.aspx?id=6030
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