36 terms

# math chapter 1

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