Lessons and Tools for Teachers

#### Lessons for Triangles

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• Geometry 3 - … : * The Sum of the Angle Measures of a Triangle * Congruent Triangles * Isosceles Triangles and Equilateral Triangles * Right Triangles and the Pythagorean Theorem * Parallel Lines and … GEOMETRY Isosceles Triangles and Equilateral Triangles There are several special types of triangles. An Isosceles triangle is one such type. An isosceles triangle has at … Triangles An Equilateral triangle is another special type of triangle. An equilateral triangle has three sides of equal length. In Figure 12, each triangle is …
• The Fun Polygon - … ) -Textbook -Tricky Triangles and True Triangles (See Attached File.) -Traveling Triangles (See Attached File.) -Crayons and/or colored pencils -Equilateral Triangles manipulatives (See Attached … for Triangles 3-7. (Triangle 1: three lines; Triangle 2: none; Triangle 3: none; Triangle 4: one line; Triangle 5: one line; Triangle 6: one line; and Triangle … each triangle by combining its angle and side classifications. For example, Triangle 1 is an acute equilateral triangle, Triangle 2 is a right scalene triangle
• Similarity and Congruence - … . Compare this triangle to triangle ABC. [the two are similar]. Use the definition of similar triangles to justify that the triangles are similar. Lead … of the sides of each triangle (side-side-side triangle congruence). The two triangles are similar by angle-angle triangle similarity. 1.2 1 … segment DE. Is triangle ABC congruent to triangle DBE? Use mathematics to justify your answer. 5. Is triangle ABC similar to triangle DBE? Use …
• Points of Concurrency Related to Archaeology - … right triangle two of the altitudes are the legs of the triangle with the third altitude inside the triangle. In an acute triangle all three altitudes lie inside the triangle. In an obtuse triangle one altitude is inside and two are outside the triangle Scoring …