Other
University of Evansville: Encyclopedia Triangle Centers
This site contains a comprehensive study of triangle centers. Seems more for an advanced level. Provides a list of six links to 1114 centers.
Other
Mathematics Internet Library: Free Internet Books
Practice problem worksheets are available for students needing to study basic terms relating to triangles and other math concepts.
Other
Technical Tutoring: Trigonometry: The Very Fast Review
This site is a quick review of the functions and identities in trigonometry. Very helpful site.
Other
Ic Teachers: Shapes: Triangles
Are you looking for a very basic website that will explain the basic properties of a triangle? Use this site to learn about the properties of equilateral triangles, isosceles triangles, right triangles,and scalene triangles. There are...
New York Times
New York Times: Crossword Puzzle: Musical Instruments
An interactive and printable crossword puzzle developed by the New York Times Learning Network. The theme of this puzzle is Musical Instruments.
Sophia Learning
Sophia: Medians of a Triangle: Lesson 5
This lesson introduces the medians of a triangle. It is 5 of 6 in the series titled "Medians of a Triangle."
Quia
Ixl Learning: Identify Shapes I
This interactive media source asks students to determine which picture shape matches the name of the shape that is displayed in each question.
Sophia Learning
Sophia: Triangle Exterior Angles Theorem: Lesson 3
This lesson introduces the exterior angles theorem of triangles. It is 3 of 5 in the series titled "Triangle Exterior Angles Theorem."
Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 5
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 5 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Triangle Interior Angles Practice: Lesson 1
This lesson provides practice problems that involve the sum of the interior angles of triangles. It is 1 of 6 in the series titled "Triangle Interior Angles Practice."
Sophia Learning
Sophia: Understanding the Area of a Triangle
This lesson will explore ways to determine the area of a triangle.
National Council of Teachers of Mathematics
Nctm: Figure This: Fractals
Can you figure out what pattern comes next? Explore patterns and perimeter in this math challenge on fractals. A one page activity from the NCTM Math Challenges for Families collection.
ClassFlow
Class Flow: Product Triangles
[Free Registration/Login Required] The teacher will use this lesson plan to review product triangles.
ClassFlow
Class Flow: Review of Area
[Free Registration/Login Required] This flipchart is a review of calculating the area of squares, rectangles, and triangles for fifth graders. It also includes problems that work backwards from the area to find missing dimensions. It...
ClassFlow
Class Flow: Surface Area
[Free Registration/Login Required] In this lesson students learn how to find surface area of rectangular and triangular solids.
ClassFlow
Class Flow: Triangle Segments
[Free Registration/Login Required] In this flipchart, students use the interactive features of Activstudio to understand how to use the properties of perpendicular bisectors, angle bisectors, medians and altitudes of a triangle.
ClassFlow
Class Flow: Triangles and Angles
[Free Registration/Login Required] Classify angles by their side and angles. Find angles and measure in triangles.
ClassFlow
Class Flow: Two Dimensional Shapes Identify and Match
[Free Registration/Login Required] This flipchart helps students to analyze and compare various two-dimensional shapes according to the vertices, sides and parallel lines. It features "containers" created in Version 3 (can be used with...
ClassFlow
Class Flow: Area
[Free Registration/Login Required] This creative and engaging flipchart explains the area of all kinds of shapes, to include squares, parallelograms, rectangles, triangle, and trapezoids.
ClassFlow
Class Flow: Braun Polygons
[Free Registration/Login Required] This flipchart is a simple diagram showing the sides and triangles in a polygon.
ClassFlow
Class Flow: Classifying Triangles
[Free Registration/Login Required] This lesson covers methods of classifying triangles, both according to the length of their sides and by the measure of their interior angle.
ClassFlow
Class Flow: Classifying Triangles
[Free Registration/Login Required] This flipchart introduces students to the different types of triangles and how to classify them.