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View Resource Inequalities in Triangles

This geometry lesson from Illuminations introduces a hands-on learning activity for students in grades 9-12. The class will use pasta to create models of triangles. They will examine the relationship between sides and angles of triangles. The triangle inequality model will be used to solve geometry problems, and the inequality for sides and angles in a triangle will also be examined. The lesson...

View Resource Hospital Locator

This geometry lesson from Illuminations presents a real-world problem for students to solve with mathematical functions. The material involves constructing the circumcenter and incenter of a triangle. Learners will gain an understanding of how the circumcenter and incenter involve bisecting the triangle's sides and angles. The lesson is appropriate for grades 9-12 and should require 1 class...

View Resource 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...

View Resource 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...

View Resource 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...

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