CHAPTER 3 MAIN CONCEPTS
3.1 Polygon,
Rotational Symmetry
Reflectional Symmetry
3.2 Definitions and pictures of:
trapezoid
parallelogram
rhombus
rectangle
square
All properties of quadrilaterals discovered in the
Explorations on pg 149-150
3.3 transversal
parallel lines cbt -->
corr. angles are congruent
alt. interior angles are congruent
alt. exterior angles are congruent
consecutive interior angles are
supplementary
algebra practice with parallel lines.
3.4 Ways to prove lines are parallel
if corresponding angles are congruent ---> lines parallel
if alt. interior angles are congruent ---> lines parallel
if alt exterior angles are congruent ---> lines parallel
if consecutive interior angles are
supplementary ---> lines parallel
two lines perpendicular to the same line are parallel to each
other
two lines parallel to a third line are parallel to each other.
3.5 Parallel Postulate
Triangle Sum Theorem
Exterior Angle Theorem
3.6 Convex and Concave Polygons
S = (n - 2)180
a = (n-2)180/n
Exterior Angle Sum of all polygons = 360
(You should know how to explain all the formulas
using the explorations we did)
3.7 Properties of the Midsegment of a triangle
Properties of the Midsegment of a trapezoid.
3.8