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Can a used-car salesman introduce the subject of triangles? One does in this program, which begins with the fundamentals, including how to classify triangles both by their sides and by their angles. In addition, two theorems are introduced and proved, and four corollaries are presented. Three problems are worked out as well, using the Side-Side-Side, Side-Angle-Side, and Angle-Side-Angle Postulates. (22 minutes)



 
                

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Copyright date: ©1999




     


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Geometry Basics
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This program presents the building blocks that every student of geometry needs to understand. Topics addressed include inductive and deductive reasoning; terminology such as points, lines, planes, and space; six core postulates; five essential theore...(more details)
 
Right Triangles and the Pythagorean Theorem
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Who is Pythagoras, and why is he so important to geometry? Using a pithy discussion of altitudes and how to solve for the side lengths of right triangles-plus two proofs involving an altitude drawn in a right triangle-this program neatly sets the sta...(more details)
 
Similar Triangles
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If Pam and a telephone pole are each casting a shadow, how can the height of the pole be determined indirectly? This program keeps the subject of similar triangles in proportion as it describes the Angle-Angle Similarity Postulate and the Side-Angle-...(more details)
 
Quadrilaterals and Other Polygons
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In this program, an explorer, a secret agent, and other experts take a look at the wide spectrum of polygons, ranging from triangles to n-gons. An examination of the general properties of polygons, including a discussion of concave and convex regions...(more details)
 
Parallel Lines and Angles
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Euclid may not have invented parallel lines, but he was probably the first to recognize their implications. This program wraps up the topic of angles by introducing the Parallel Postulate and the Corresponding Angle Postulate, along with three theore...(more details)
 


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