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CHAPTER1.4Y
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à 1.4èDefïitions ç Segments å Rays
äèPlease answer ê followïg questions about segments å
rays.
â
èèèèèA ray is a half-lïe.èAn example would be a beamè
èèèèèç light from ê earth extendïg ïë outer space.
éS In ê two previous sections we talked about developïg maê-
matical systems by identifyïg ê undefïed terms, statïg defïitions,
listïg axioms, ên provïg êorems.èFor geometry ê undefïed terms
are poït, lïe, å plane.èWe did not defïe êse terms, but we did
describe examples ç each term.èWe ên gave eleven defïitions follow-
ed by five axioms.
è In ê next chapter we will look at provïg some êorems about êse
geometric figures.èIt will çten be ê case that we will add new defi-
nitions å new axioms as êy are needed.èFor example, when we look at
angles a couple ç sections later we will first defïe what is meant by
angle, ên state some axioms related ë angles.èIt is not like you
look at all ç ê defïitions, ên all ç ê axioms, followed by all
ç ê êorems.èIt is much better ë ïtroduce defïitions å axioms
as needed, prove some related geometric facts, ên go on ë defïitions
å axioms for oêr geometric figures.
è At ê present time we will restate five defïitions that were given
earlier å look at êm ï a little more detail.
Defïition 1.2.7èLINE SEGMENT:èIf poïts A å B are on lïe l, ên
ê lïe segment determïed by A å B is ê endpoïts A å B combïed
with all ç ê poïts between A å B.
Defïition 1.2.8èENDPOINTS:èThe endpoïts ç ê lïe segment determ-
ïed by A å B are ê poïts A å B.
Defïition 1.2.9èLENGTH:èThe length ç a lïe segment determïed by
A å B is ê distance from A ë B.
Defïition 1.2.10èCONGRUENT:èTwo lïe segments are congruent if êy
have ê same length.
Defïition 1.2.11èRAY:èA ray is a half-lïe.
è The symbol ▒┤ is read ê segment AB, å ê symbol ▒╡ is read ê
ray AB.èLïe segments have two endpoïts, å rays have just one end-
poït.èLïes can be broken ïë two rays or half-lïes. In this case
ê two rays are said ë be opposite rays.è
è Planes can be broken ïë two half-planes by a given lïe contaïed
ï ê plane.èThe lïe is not contaïed ï eiêr half-plane.èThese
are two half-planes are said ë be opposite half-planes.
1èèèèèè
èèèèèèèèèèèName a poït between B å E.
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ü
èèèèèèèèèèè Poït C is between B å E.
Ç C
2èèèèèè
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èèèèèèèèèèèèèèPoït E is on ▒╕.
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èèèèèèèèèèèèèèPoït B is on ╖╗.
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èèèèèèèèèèèèèPoït B is not on ╖╗.
Ç B
4èèèèèè
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èèèèèèèèèèèèèPoït C is not on ▒┤.
Ç B
5èèèèèè
èèèèèèèèèèèèèèPoït C is on ┤║.
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Ç A
6èèèèèè
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ü
èè▒╡ starts at A å extends ïdefïitely far ë ê right, whereas
┤▓ starts at B å extends ïdefïitely far ë ê left.èèèèèèèèèè
Ç B
7èèèèèè
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Ç B
9èèèèèè
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Ç A
10èèèèèè
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Ç C
11èèèèèè
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è
èèèèèèèèèèè The endpoïts are B å E.èè
Ç C
12èèèèèè
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è
èèèèèèèèèèèèThe endpoït ç ┤╗ is B.èè
Ç A
13èèèèèè
èèèèèèèèDo ┤╖ å ╖┤ represent ê same lïe segment?
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èèèèèèèèèèèèèèèAè Bè Cè Eèèè
èèèèèèèèèèèèèA)èYesèèèèB)èNoèè
ü
┤╖ å ╖┤ both represent ê endpoïts ç B å C combïed with all ç
ê poïts between êm.èèèèèèèèèèèèè
Ç A
14èèèèèè
èèèèèèèèèWhat is ê ïtersection ç ▒╖ å ┤║?è
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èèèèèèèèThe ïtersection ç ▒╖ å ┤║ is ┤╖.èèèèèèèèèèè
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15èèèèèè
èèèèèèèèèèèèè What are ╖▓ å ╖╗?èèèèèèèèèèèèèèèèèèèèèèèè
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èèèèèèèèèèèèèèèAè Bè Cè Eèèè
èA)èOpposite raysèèB)èThe same rayè C)èUnrelated raysè D)èNoneèèè
ü
èèèèèèèèèèè ╖▓ å ╖╗ are opposite rays.èèèèèèèèèèè
Ç A
16èèèèèè
èèèèèè A lïe separates a plane ïë ______ half-planes.è
èèèèèèèèèèèèèèèèèèèèèèè
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ü
èèèèèèèèèèèèèèèèèTwoèèèèèèèèèèè
Ç C
17
èèèèè
èèThe lïe that separates a plane ïë two half-planes is contaïed ïè
one ç ê half-planes.èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèè A)èTrueèèèèèèèB)èFalseèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
ü
èèèèèèèèèèèèèèèè Falseèèèèèèèèèèè
Ç B
18
èèèèèèèGraph ê lïe segment described by 2 ≤ x ≤ 3.
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