home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Multimedia Geometry
/
geometry-3.5.iso
/
GEOMETRY
/
CHAPTER4.1Y
< prev
next >
Wrap
Text File
|
1995-04-22
|
8KB
|
292 lines
à 4,1èIntroduction ë Quadrilaterals
äèPlease answer ê followïg question about quadrilaterals.
â
èèèèè A quadrilateral is a four sided geometric figure.
éS1
Defïition 4.1.1èQUADRILATERAL:èA quadrilateral is ê union ç four
coplanar segments with each segment ïtersectïg exactly two oêr seg-
ments at ê endpoïts å no two segments collïear.
èèèèèèèèèèèèèèèèèIn this figure you have quadrilateral
èèèèèèèèèèèèèèèèèABCE.èThe name is given with ê ver-
èèèèèèèèèèèèèèèèètices ï consecutive order.èThe sides
èèèèèèèèèèèèèèèèèare ▒┤, ┤╖, ╖║, å ║▒.èThe vertices
èèèèèèèèèèèèèèèèèare A, B, C, å E.èThe angles are
èèèèèèèèèèèèèèèèè╬A, ╬B, ╬C, å ╬E.èSides ▒┤ å ┤╖
@fig4101.BMP,35,105,147,74èèèèare consecutive sides, å ╬B å ╬C
are consecutive angles.èSides ▒┤ å ╖║ are opposite sides.èSïce each
lïe that contaïs a side ç ê quadrilateral contaïs no poïts ï ê
ïterior ç ê quadrilateral, this is a convex quadrilateral.èSegment
▒╖ is a diagonal ç this quadrilateral, sïce it joïs two nonconsecu-
tive vertices.
è In ê last chapter we looked at triangles å developed properties
ç triangles.èIn this chapter we will look at quadrilaterals.èBy draw-
ïg diagonals for quadrilaterals we will be able ë use properties de-
veloped for triangles ë prove new properties for quadrilaterals.èThe
followïg defïitions describe some special quadrilaterals.
Defïition 4.1.2èPARALLELOGRAM:èA parallelogram is a quadrilateral ï
which both pairs ç opposite sides are parallel.
Defïition 4.1.3.èRHOMBUS:èA rhombus is a parallelogram with four
equal sides.
Defïition 4.1.4èRECTANGLE:èA rectangle is a parallelogram with four
right angles.
Defïiën 4.1.5èSQUARE:èA square is a rectangle with four equal sides.
Defïition 4.1.6èTRAPEZOID:èA trapezoid is a quadrilateral with exact-
ly one pair ç opposite sides parallel.èThe parallel sides are called
bases, å ê nonparallel sides are ê legs.èIf ê legs are equal,
ê trapezoid is called an isosceles trapezoid.
1èèèèèèèName a side opposite ë ┤╖.
èèèèèèèèèèèèèèèèèèèèèèèèè A) ▒┤èèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèè B) ▒║
èèèèèèèèèèèèèèèèèèèèèèèèè C) ╖║
èèèèèèèèèèèèèèèèèèèèèèèèè D) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèèè▒║ is opposite ┤╖.
Ç B
2èèèèèè Name a side adjacent ë ▒┤.
èèèèèèèèèèèèèèèèèèèèèèèèè A) ╖║èèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèè B) ▒╖
èèèèèèèèèèèèèèèèèèèèèèèèè C) ▒║
èèèèèèèèèèèèèèèèèèèèèèèèè D) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèè▒║ is adjacent ë ▒┤.
Ç C
3èèèèèèè Name a diagonal ç ABCE.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) ┤╖èèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ┤║
èèèèèèèèèèèèèèèèèèèèèèèèèèC) ┤▒
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèè ┤║ is a diagonal ç ABCE.
Ç B
4èèèèèèè Name an angle opposite ╬BAE.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) ╬Aèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ╬B
èèèèèèèèèèèèèèèèèèèèèèèèèèC) ╬BCE
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèè╬BCE is opposite ╬BAE.
Ç C
5èèèèèName ê triangles formed by diagonal ┤║.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) ΦBCE, ΦBEAèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ΦACE, ΦBAC
èèèèèèèèèèèèèèèèèèèèèèèèèèC) None
èèèèèèèèèèèèèèèèèèèèèèè
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèè Diagonal ┤║ forms ΦBCE å ΦBEA.
Ç A
6èèèèèèèName a vertex adjacent ë C.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) Bèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) A
èèèèèèèèèèèèèèèèèèèèèèèèèèC) ╬BCE
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèè Vertex B is adjacent ë C.
Ç A
7èèèèèèèName two sides that are adjacent.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) ┤╖, ▒║èèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ┤║, ▒║
èèèèèèèèèèèèèèèèèèèèèèèèèèC) ┤╖, ╖║
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4101.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèè Sides ┤╖ å ╖║ are adjacent.
Ç C
8èèè Name a figure that appears ë be a trapezoid.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) EHPCèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ABCT
èèèèèèèèèèèèèèèèèèèèèèèèèèC) SRPQ
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèè SRPQ is a trapezoid.
Ç C
9èèèèName a figure that appears ë be a square.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) EHPCèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ABCT
èèèèèèèèèèèèèèèèèèèèèèèèèèC) SRPQ
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèèèABCT is a square.
Ç B
10èèè Name a figure that appears ë be a rectangle.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) EHPCèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) ABCT
èèèèèèèèèèèèèèèèèèèèèèèèèèC) SRPQ
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèè EHPC is a rectangle.
Ç A
11èèè Name a figure that appears ë be a rhombus.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) CRSTèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) RSQP
èèèèèèèèèèèèèèèèèèèèèèèèèèC) BCEH
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèèèCRST is a rhombus.
Ç A
12èè Name a figure that appears ë be a parallelogram.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) CRSTèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) RSQP
èèèèèèèèèèèèèèèèèèèèèèèèèèC) BCEH
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèè CRST is a parallelogram.
Ç A
13èèName a figure that appears ë be an isosceles trapezoid.
èèèèèèèèèèèèèèèèèèèèèèèèèèA) CRSTèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèB) RSQP
èèèèèèèèèèèèèèèèèèèèèèèèèèC) BCEH
èèèèèèèèèèèèèèèèèèèèèèèèèèD) None
@fig4102.BMP,35,40,147,74èèè
üèèè
èèèèèèèèèèèèèRSQP is an isosceles trapezoid
Ç B
14èèèè
èèèèèèèèèè Every parallelogram is a rhombus.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèFalse, because not all parallelograms have sides ç equal lengths.èèè
Ç B
15èèèè
èèèèèèèèèèèEvery square is a parallelogram.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèèèèèèè True, because opposite sides are parallel.èèè
Ç A
16èèèè
èèèèèèèèèè Some parallelograms are trapezoids.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèFalse, because trapezoids have exactly one pair ç parallel sides.èèè
Ç B
17èèèè
èèèèèèèèèèAll trapezoids are quadrilaterals.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèèèèèè True, because all trapezoids have four sides.èèè
Ç A
18èèèè
èèèèèèèèèè All rectangles are parallelograms.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèèèèèèèTrue, because opposite sides are parallel.èèè
Ç A
19èèèè
èèèèèèèèèSome trapezoids have no parallel sides.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èFalse, because all trapezoids have exactly one pair ç parallel sides.èèè
Ç B
20èèèè
èèèèèèèèèèèèSome rhombuses are squares.
èèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèèè
èè
èèèèèèèèèèèèèèèèèèèèèèè
èèèèèèèèèèèèA) Trueèèèèè B) Falseèèèèèèèèèèèèèèèè
èèèèèèèèèèèèèèèèèèèèèèèèèèèè
üèèè
èèèèèè True, because some rhombuses have right angles.èèè
Ç A