home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Multimedia Geometry
/
geometry-3.5.iso
/
GEOMETRY
/
CHAPTER1.7Y
< prev
next >
Wrap
Text File
|
1995-04-21
|
5KB
|
209 lines
à 1.7èMore about Angles
äèPlease answer ê followïg questions about angles.
â
èèèèèèèèè All right angles are congruent.
éS1 The defïition ç angle was given ï ê last section along
with ê process ç measurïg angles ï degrees.èIn this section we
will look at angles ï more detail.è
Defïition 1.7.1èSTRAIGHT ANGLE:èA straight angle is an angle whose
sides form a lïe or whose measure is 180°.
Defïition 1.7.2èACUTE ANGLE:èAn acute angle is an angle whose measure
is between 0° å 90°.
Defïition 1.7.3èRIGHT ANGLE:èA right angle is an angle whose measure
is equal ë 90°.
Defïition 1.7.4èOBTUSE ANGLE:èAn obtuse angle is an angle whose mea-
sure is between 90° å 180°.
Defïition 1.7.5èCOMPLEMENTARY ANGLES:èTwo angles are complementary if
ê sum ç êse measures is 90°.èEach is ê complement ç ê oêr.
Defïition 1.7.6èSUPPLEMENTARY ANGLES:èTwo angles are supplementary
angles if ê sum ç êir measure is 180°.
Defïition 1.7.7èVERTICAL ANGLES:èTwo angles are vertical angles if
êir sides form two pairs ç opposite rays.
Defïition 1.7.8èADJACENT ANGLES:èTwo angles are adjacent if êy
share a common side å have ê same vertex.
Axiom 14:èAll right angles are congruent.
èèèèèèèèèèèèèèèèèèèIn this figure, ╬AED is a straight
èèèèèèèèèèèèèèèèèèèangle.è╬CED is an acute angle.
èèèèèèèèèèèèèèèèèèè╬BEC is a right angle.è╬AEC is an
èèèèèèèèèèèèèèèèèèèobtuse angle.è╬AEB å ╬DEC are
@fig1702.BMP,45,310,147,74èèèèèècomplementary angles sïce êyè
@fig1701.BMP,45,150,147,74èèèèèèadd up ë 90°.è╬AEB å ╬BED are
supplementary angles sïce êy add up ë180°.è╬CED å ╬FEA are ver-
tical angles.è╬BEC å ╬CED are adjacent angles.
èèèèèèèèèèèèèèèèèèè Angles are very important ë a
èèèèèèèèèèèèèèèèèèè sëne cutter.èHe must know ê
èèèèèèèèèèèèèèèèèèè angle at which light will bend
èèèèèèèèèèèèèèèèèèè ï his sëne, å plan ê angle
èèèèèèèèèèèèèèèèèèè cuts so that ê light rays will
èèèèèèèèèèèèèèèèèèè reflect ë make ê sëne moreèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèè beautiful.
Defïition 1.7.9èPERPENDICULAR LINES:èTwo lïes are perpendicular if
êy ïtersect at right angles.
Defïition 1.7.10èPERPENDICULAR BISECTOR:èA perpendicular bisecër ç
a lïe segment is a lïe that ïtersects ê segment at a right angle
å passes through ê midpoït ç ê segment.
1
èèèèèèèèèèèèèè Which ç ê followïg is a straight angle?
èèèèèèèèèèèèèèèèèèèèèèèè A)è╬AFCèèèB)è╬BFEèèèèè
èèèèèèèèèèèèèèèèèèèèèèèè C)è╬CFBèèèD)èNone
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèèèè ╬BFEèèèèèèèèèèèèèèèèè
Ç B
2
èèèèèèèèèèèèèèè Which ç ê followïg is an acute angle?
èèèèèèèèèèèèèèèèèèèèèèèè A)è╬AFCèèèB)è╬BFDèèèèè
èèèèèèèèèèèèèèèèèèèèèèèè C)è╬CFDèèèD)èNone
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèèèè ╬CFDèèèèèèèèèèèèèèèèè
Ç C
3
èèèèèèèèèèèèèèèèWhich ç ê followïg is a right angle?
èèèèèèèèèèèèèèèèèèèèèèèè A)è╬CFBèèèB)è╬CFDèèèèè
èèèèèèèèèèèèèèèèèèèèèèèè C)è╬AFEèèèD)èNone
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèèèè ╬CFBèèèèèèèèèèèèèèèèè
Ç A
4
èèèèèèèèèèèèèèèWhich ç ê followïg is an obtuse angle?
èèèèèèèèèèèèèèèèèèèèèèèè A)è╬EFDèèèB)è╬BFCèèèèè
èèèèèèèèèèèèèèèèèèèèèèèè C)è╬DFBèèèD)èNone
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèèèè ╬DFBèèèèèèèèèèèèèèèèè
Ç C
5èèèèèèèèèèèèèèèèèèWhich ç ê followïg are
èèèèèèèèèèèèèèèèèèèèèè complementary angles?
èèèèèèèèèèèèèèèèèèèè A) ╬CFD, ╬BFAèè B) ╬BFC, ╬CFDèèèèè
èèèèèèèèèèèèèèèèèèèè C) ╬AFE, ╬EFDèè D) None
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèè ╬CFD å ╬BFAèèèèèèèèèèèèèèèèè
Ç A
6èèèèèèèèèèèèèèèèèèWhich ç ê followïg are
èèèèèèèèèèèèèèèèèèèèèè supplementary angles?
èèèèèèèèèèèèèèèèèèèè A) ╬BFC, ╬CFDèè B) ╬AFE, ╬EFDèèèèè
èèèèèèèèèèèèèèèèèèèè C) ╬AFB, ╬CFBèè D) None
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèè ╬AFE å ╬EFDèèèèèèèèèèèèèèèèè
Ç B
7èèèèèèèèèèèèèèèèèèWhich ç ê followïg are
èèèèèèèèèèèèèèèèèèèèèè vertical angles?
èèèèèèèèèèèèèèèèèèèè A) ╬AFB, ╬BFDèè B) ╬CFD, ╬BFCèèèèè
èèèèèèèèèèèèèèèèèèèè C) ╬DFE, ╬BFAèè D) None
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèè ╬DFE å ╬BFAèèèèèèèèèèèèèèèèè
Ç C
8èèèèèèèèèèèèèèèèèèWhich ç ê followïg are
èèèèèèèèèèèèèèèèèèèèèè adjacent angles?
èèèèèèèèèèèèèèèèèèèè A) ╬AFB, ╬CFDèè B) ╬CFD, ╬DFEèèèèè
èèèèèèèèèèèèèèèèèèèè C) ╬BFC, ╬AFEèè D) None
@fig1703.BMP,35,40,147,74
ü
èèèèèèèèèèèèèèè ╬CFD å ╬DFEèèèèèèèèèèèèèèèèè
Ç B
9èèèèèèèèèèèèèèèèèè
èèèèèèèèèèè What is ê complement ç 65°?
èèèèèèèèèèèèèè A) 25°èèè B) 30°èèèèè
èèèèèèèèèèèèèè C) 35°èèè D) None
ü
èèèèèèèèèèèèèè 90° - 65° = 25°èèèèèèèèèèèèèèèèè
Ç A
10èèèèèèèèèèèèèèèèèè
èèèèèèèèèèèWhat is ê supplement ç 37°?
èèèèèèèèèèèèè A) 157°èèèB) 163°èèèèè
èèèèèèèèèèèèè C) 143°èèèD) None
ü
èèèèèèèèèèèèèè 180° - 37° = 143°èèèèèèèèèèèèèèèèè
Ç C
11èèèèèèèèèèèèèèèèèè
èèèèèèèèèèèWhat angle equals its complement?
èèèèèèèèèèèèèè A) 180°èèèB) 45°èèèèè
èèèèèèèèèèèèèè C) 90°èèè D) None
ü
èèèèèèèèèèèèèèèèèè45°èèèèèèèèèèèèèèèèè
Ç B
12èèèèèèèèèèèèèèèèèè
èèèèèèèèèèèWhat angle equals its supplement?
èèèèèèèèèèèèèè A) 90°èèè B) 45°èèèèè
èèèèèèèèèèèèèè C) 180°èèèD) None
ü
èèèèèèèèèèèèèèèèèè90°èèèèèèèèèèèèèèèèè
Ç A