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Geometry
POSTULATES/ THEOREMS CHAPTER 3
1. Corresponding Angles Postulate – If a transversal intersects 2 parallel lines, then
corresponding < are congruent
2. Alternate Interior Angles Theorem –If a transversal intersects 2 parallel lines, then
alternate interior angles are congruent
3. Same- Side Interior Angles Theorem - If a transversal intersects 2 parallel lines, then
same side-interior angles are supplementary.
4. Converse of the Corresponding Angles Postulate - If two lines and a transversal form
corresponding angles that are congruent, then the two lines are parallel.
5. Converse of the Alternate Angles Theorem -If two lines and a transversal form
alternate interior angles that are congruent, then the two lines are parallel.
6. Converse of the Same-Side Interior Angles Theorem -If two lines and a transversal
form same-side interior angles that are supplementary, then the two lines are parallel.
7. Theorem - If two lines are parallel to the same line, then they are parallel to each
other.
8. Theorem - In a plane, if two lines are perpendicular to the same line, then they are
parallel to each other.
9. Triangle Angle-Sum Theorem – adds up to 180
10. Triangle Exterior Angle Theorem – the measure of each ext < is the sum of the 2
remote interior <.
11. Polygon Angle-Sum Theorem –The sum of the measures of the angles on an n-gon is
(n-2)180.
12. Polygon Exterior Angle-Sum Theorem –The sum of the measures of the exterior
angles of a polygon, one at each vertex, is 360.