# Chapter 3: Postulates, Theorems, and Corollaries

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Corresponding angle Postulate

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### 24 Terms

1

Corresponding angle Postulate

If 2 parallel lines are cut by a transversal, then the corresponding angles are congruent

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2

Alternate interior angle theorem

If 2 parallel lines are cut by a transversal, then the alternate interior angles are congruent

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3

Same side interior angle theorem

If 2 parallel lines are cut by a transversal, then the same side interior angles are supplementary

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4

Alternate exterior angle theorem

If 2 parallel lines are cut by a transversal, then the alternate exterior angles are congruent

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5

Same side exterior angle theorem

If 2 parallel lines are cut by a transversal, then the same side exterior angles are supplementary

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6

Perpendicular transversal theorem

If a transversal is perpendicular to 1 of 2 parallel lines then it is perpendicular to the other

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7

Converse of the Corresponding angle Postulate

If 2 lines are cut by a transversal and the corresponding angles are congruent, the then lines are parallel

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8

Converse of the Alternate interior angle theorem

If 2 line are cut by a transversal and the alternate interior angles are congruent, then the lines are parallel

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9

Converse of the same side interior angle theorem

If 2 line are cut by a transversal and the same side interior angles are supplementary, then the lines are parallel

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10

Converse of the alternate exterior angle theorem

If 2 line are cut by a transversal and the alternate exterior angles are congruent, then the lines are parallel

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11

Converse of the same side exterior angle theorem

If 2 line are cut by a transversal and the same side exterior angles are supplementary, then the lines are parallel

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12

Converse of the perpendicular transversal theorem

In a plane, 2 lines perpendicular to the same line, are parallel

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13

Parallel postulate

Given a line and a point not on that line, there is exactly 1 line THROUGH THE POINT parallel to the given line

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14

Perpendicular postulate

Given a line and a point not on that line, there is exactly 1 line THROUGH THE POINT perpendicular to the given line

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15

Theorem 3-10 (parallel transitive)

2 lines parallel to the same line, are parallel to each other

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16

Triangle exterior angle theorem

The measure of an exterior angle in a triangle is equal to the sum of the remote INTERIOR angles

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17

Interior angle sum theorem

The sum of the measures of the interior angles of a CONVEX polygon is (n - 2)*180

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18

Exterior angle sum theorem

The sum of the measures of the exterior angles of a polygon is 360 degrees

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19

Triangle ANGLE SUM theorem

The sum of the measures of the angles of a triangle equals 180 degrees

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20

Describe corollaries

A statement that follows readily after a theorem

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21

3rd angle corollary (tri. <. + theo)

If 2 angles of 1 triangle are congruent to 2 angles of another triangle, then the 3rd angles are congruent

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22

Corollary 2 (tri. <. + theo.)

Each angle of angle equiangular triangle has a measure of 60 degrees

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23

Corollary 3 (tri. <. + theo.)

In a triangle, there can be AT MOST 1 right or 1 obtuse angle

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24

Corollary 4 (tri. <. + theo.)

The acute angles of a right triangle are complementary

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