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I4C

7th Grade - Similar Triangles

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Use similar triangles and proportionality to find the lengths of unknown line segments in a triangle. 0706.4.2


Links verified on 6/11/2014


  1. A Mathematical Droodle - Two Triples of Similar Triangles This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  2. Compass and Straightedge Construction of Similar Triangles - lesson plan from PlanetMath A lesson plan can be found at this site
  3. Connecting Geometry: Similar Triangles - Similar triangles can be very useful for measuring inaccessible objects. One method of doing this is called "shadow reckoning," which this page describes
  4. Indirect Measurement with Similar Triangles - this five page lesson plan describes how to use a mirror in making indirect measurements. [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.] An Adobe Acrobat document in .pdf format A lesson plan can be found at this site
  5. Math Open Reference: Similar Triangles - interactive triangle lesson This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  6. Measuring Angles - use a virtual protractor This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  7. Proof Using Similar Triangles - four examples to print and use in your classroom A Microsoft Word document to be downloaded This link includes something for the teacher to print
  8. Proportionality in Similar Triangles: A Cross-Cultural Comparison - a lesson plan from Convergence: a magazine of the Mathematical Association of America [This expired link is available through the Wayback Machine Internet Archive. If the page doesn't load quickly click on Impatient? at the bottom right of the page.] A lesson plan can be found at this site
  9. Protractor - learn how to position and read a protractor in order to measure an angle, and how to use either scale on the protractor This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  10. A PowerPoint show related to this standardSimilar Triangles - a 23 slide PowerPoint show which includes scaling factors
  11. A PowerPoint show related to this standardSimilar Triangles II - a 14 slide PowerPoint show
  12. Similar Triangles - explanation of the concept
  13. Similar Triangles - includes the AA rule and the RAR rule plus two videos A video is available through this link
  14. Similar Triangles and Indirect Measurement - this worksheet gives a short review, an example and five practice problems An Adobe Acrobat document in .pdf format This link includes something for the teacher to print
  15. Similar Triangles and the Pythagorean theorem - from Dave's Short Trig Course
  16. Strategies for Dealing with Similar Triangles - from Oswego City School District Regents Exam Prep Center
  17. Sum of Angles in a Triangle - students can explore this concept by moving the vertices of the triangle with pressed mouse button This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  18. Three Similar Triangles - a math droodle This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard
  19. Triangle Calculator - Enter values three of the six sides and angles of the triangle and the other three values will be computed. The number of significant values entered will determine the number of significant figures in the results.
  20. Understanding Scale Factors - Similar Triangles: Perimeters and Areas - When two triangles are similar, the reduced ratio of any two corresponding sides is called the scale factor of the similar triangles
  21. An Adobe Acrobat document in .pdf formatUsing Similar Triangles and Rectangles - in this investigation, you can use similar triangles to estimate heights and distances that are difficult to measure directly A lesson plan can be found at this site
  22. Virtual Manipulative - Similar Triangles This site is interactive and allows students to play a game or input or collect data or This interactive site would work well on an interactive whiteboard

Internet4classrooms is a collaborative effort by Susan Brooks and Bill Byles.
 

  

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