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Science -- Mathematics -- Geometry -- Special topics in plane geometry -- Straight lines, angles, triangles, etc.
1 - 5
Reflect on This
This geometry lesson from Illuminations examines regular polygons. Students will study reflections using hinged mirrors and examine the interior angles of regular polygons. The lesson allows students to look at the...
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...
Proportionality in Similar Triangles: A Cross-Cultural Comparison
In the introduction to this site we learn that, "A fundamental result of geometry, used often in secondary and collegiate mathematics, is the equality of ratios of corresponding sides in similar triangles." Accordingly...
The Many Ways to Construct a Triangle
In general, a triangle is defined by its three elements. SAS, ASA, and SSS provide three well-known examples but there are many more. Bogomolny provides a table of constructions (linked to constructions) and invites...
Frequently Asked Questions About Trigonometry
This is an interactive site that explains the ideas behind trigonometry. It also offers hands on experience in working with triangles.
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