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Chapter ended september 24th 2012
CHAPTER TEST SAME DAY

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conjecture

reasoning that involves the formation of conclusions from incomplete evidence

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counterexample

an example that shows a conjecture is false or incorrect

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space

made up of all points

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plane

a flat surface without thickness

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coplaner

points and line on the same plane

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postulate

accept state ment

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ray

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

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opposite rays

two collinear rays with the same end point

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parrel line

coplainer lines that never intersect

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skew lines

lines that are not parrel and DON"T intersect

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congruent segments

two segments with same leangth

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midpoint

divids the line segment in half

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congruent angles

angles with the same measure

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vertical angles

two angles that are oppisite rays

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complementry angles

Two angles that add up to 90 degrees

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adjacent angles

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

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supplementary angle

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

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perpidicular lines

lines that intersect to form a right angle

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angle bisector

a ray that divids a coplaier into 2 equal angles

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perimeter

the size of something as given by the distance around it

P= L+L+W+W or P= 2L+ 2W

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area

the extent of a 2-dimensional surface enclosed within a boundary

A= L*W²

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circumfrance

The distance around a circle

2πR or pie D

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area of circle

pie R*R , A=πr²

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inches to feet

12 in = 1 foot

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inches to yards

36in = 1 yard

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feet to yards

3ft = 1 yard

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feet to a mile

5,280 = 1 mile

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millimeters to centimeters

10mm = 1 cm

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centimeters to meters

100cm =1 m