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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

point

location

space

made up of all points

line

a seris of points

plane

a flat surface without thickness

coplaner

points and line on the same plane

postulate

accept state ment

segment

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

acute angle

0<x<90

right angle

x=90

obtuse angle

90<x<180

straight angle

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

adjacent angles

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

area of circle

pie R*R , A=πr²

inches to feet

12 in = 1 foot

inches to yards

36in = 1 yard

feet to yards

3ft = 1 yard

feet to a mile

5,280 = 1 mile

millimeters to centimeters

10mm = 1 cm

centimeters to meters

100cm =1 m

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