- The Essential Idea for this section is the introduction of new terminology.
The terms that you need to pay attention to are those boldface terms
in this section: polygon, triangle, quadrilateral, pentagon, hexagon,
heptagon, octagon, nonagon, decagon, dodecagon, n-gon, vertex, angle,
equal angles, degree, and protractor. See if you can find each of these
terms in this section.
- You should be able to classify angles as follows:
Acute
angle less than 90 degrees
Right angle equal to 90 degrees
Obtuse between 90 degrees and 180 degrees
Straight equal to 180 degrees
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In this section one additional construction is considered, namely
constructing an angle congruent to a given angle.
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