Flashcards in 8.1-8.3 Deck (16)

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1

## Converse of Corresponding Angles Postulate

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

2

## converse of cointerior angle theorem

### If 2 lines are cut by a transversal & cointerior angles are supplementary, then the lines are parallel.

3

## converse of alt interior angle th

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

4

## Perpendicular & Parallel Th

### If 2 lines are perp 2 the same transversal, then they are parallel.

5

## Perp & Transversal Th

### If a transversal is perpendicular to one of two parallel lines, then its also perp to the other line.

6

## trapezoid

### quadrilateral with only 1 pair of parallel sides

7

## Triangle Sum Th

### the sum of the measures of the angles of a triangle is 180

8

## Quadrilateral Sum Th

### The sum of the measures of the angles of a quadrilateral is 360.

9

## quadrilateral is parallelogram? th

### If both pairs of opp angles of a quadrilateral are equal, then the quadrilateral is a parallelogram.

10

## exterior angle theorem

### An exterior angle of a triangle is equal in measure to the sum of its 2 remote interior angles.

11

## definition of similar

### Two triangles are similar iff their vertices can be matched up so that corresponding angles are equal & corresponding sides are in proportion.

12

## definition of congruent

### 2 triangles are congruent iff their vertices can be matched up so tht the corresponding parts (angles & sides) of the triangles r equal in measure.

13

## Triangle Similarity Postulate (AA Post)

### If 2 angles of a triangles are equal to 2 angles of another triangle, then the 2 triangles are similar.

14

## how to find any angle of a triangle?

### A = 1/2ab sin C

15

## trig

### SOH CAH TOA

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