# math chapter 1

### 36 terms by ched14

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1-3 to 1-9 Chapter ended september 24th 2012 CHAPTER TEST SAME DAY

### conjecture

reasoning that involves the formation of conclusions from incomplete evidence

### counterexample

an example that shows a conjecture is false or incorrect

location

### line

a seris of points

### plane

a flat surface without thickness

### coplaner

points and line on the same plane

### postulate

accept state ment

part of a line

### ray

a line with and end point and keeps going on the other side

### opposite rays

two collinear rays with the same end point

### parrel line

coplainer lines that never intersect

### skew lines

lines that are not parrel and DON"T intersect

### congruent segments

two segments with same leangth

### midpoint

divids the line segment in half

0<x<90

x=90

90<x<180

x= 180

### congruent angles

angles with the same measure

### vertical angles

two angles that are oppisite rays

### complementry angles

Two angles that add up to 90 degrees

two angles that share a common vertex and side, but have no common interior points

### supplementary angle

When the sum of the measures of a pair of angles add up to 180°

### perpidicular lines

lines that intersect to form a right angle

### angle bisector

a ray that divids a coplaier into 2 equal angles

### perimeter

the size of something as given by the distance around it
P= L+L+W+W or P= 2L+ 2W

### area

the extent of a 2-dimensional surface enclosed within a boundary
A= L*W²

### circumfrance

The distance around a circle
2πR or pie D

pie R*R , A=πr²

12 in = 1 foot

36in = 1 yard

3ft = 1 yard

5,280 = 1 mile

10mm = 1 cm

100cm =1 m

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