# Keywords: Triangles (312)

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# The Ambiguous Case for the Law of Sines (no triangles)

This should show the students the part of the ambiguous case where ... (more)

This should show the students the part of the ambiguous case where no triangles are formed. I simply edited the applet by galvinj by making &lt;B=60 degrees as opposed to 30 degrees used to show the two triangles case. To edit angles as I did, you need to (less)

Subject:
Mathematics and Statistics
Material Type:
Simulations
Collection:
GeoGebraTube
Provider:
GeoGebra
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# Analyzing Congruence Proofs

This lesson unit is intended to help teachers assess how well students ... (more)

This lesson unit is intended to help teachers assess how well students are able to: work with concepts of congruency and similarity, including identifying corresponding sides and corresponding angles within and between triangles; Identify and understand the significance of a counter-example; Prove, and evaluate proofs in a geometric context. (less)

Subject:
Mathematics and Statistics
Material Type:
Assessments
Lesson Plans
Collection:
Mathematics Assessment Project (MAP)
Provider:
Shell Center for Mathematical Education|University of California, Berkeley

# Are Random Triangles Acute or Obtuse?

This learning video deals with a question of geometrical probability. A key ... (more)

This learning video deals with a question of geometrical probability. A key idea presented is the fact that a linear equation in three dimensions produces a plane. The video focuses on random triangles that are defined by their three respective angles. These angles are chosen randomly subject to a constraint that they must sum to 180 degrees. An example of the types of in-class activities for between segments of the video is: Ask six students for numbers and make those numbers the coordinates x,y of three points. Then have the class try to figure out how to decide if the triangle with those corners is acute or obtuse. (less)

Subject:
Mathematics and Statistics
Material Type:
Video Lectures
Collection:
MIT Blossoms
Provider:
MIT, Learning International Networks Consortium
Author:
Gilbert Strange
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# Area Comparisons

Using alternative sets of bases and altitudes to determine the area of ... (more)

Using alternative sets of bases and altitudes to determine the area of a triangle, combined with shearing. (less)

Subject:
Mathematics and Statistics
Material Type:
Simulations
Collection:
GeoGebraTube
Provider:
GeoGebra
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