abeer lethey

النهاية التالى

.Relation between two straight lines

Polygons

النهاية السابق التالى البداية

Has neither a starting point.nor ending point

We cannot measure its length

النهاية السابق التالى البداية

Has a starting point but.not has ending point

We cannot measure its lenght

النهاية السابق التالى البداية

Has a starting point and. ending point

We can measure its lenght

النهاية السابق التالى البداية

The two straight line AB&CD have only.one common point M

So they are called((intersecting lines

النهاية السابق التالى البداية

AB and CD form four (acute-obtuse(.angles

They are > AMC, >CMB., > BMD ,> DMA

The point is called ( (intersection point

النهاية السابق التالى البداية

AB and CD are two intersection straight.lines

They form four right angles at their intersection point M

النهاية السابق التالى البداية

They are called perpendicular or orthogonal straightlines

Is denoted by

So AB CD , CD AB

النهاية السابق التالى البداية

AB and CD have not a common point.( (intersection point

Then AB and CD are.(called (parallel lines

النهاية السابق التالى البداية

This is denoted by the. (// ( symbol

We write AB // CD orCD // AB

النهاية السابق التالى البداية

. H Parallel lines

. Intersection lines 5

.F Perpendicular lines

. X Intersection lines

. M Parallel lines

. N Parallel lines E Perpendicular lines, Parallel lines.Perpendicular lines 4

.T perpendicular lines

.L Perpendicular lines

النهاية السابق التالى البداية

Is a closed shapes formed from three sides or more (line( segment

Like (triangle ,pentagon ,Quadrilateral,Hexagon, octagon…( etcالنهاية السابق التالى البداية

النهاية السابق التالى البداية

. It has( 3 (sides

. It has( 3 (angles

. It has( 3 (vertices

Like (Right angled- triangle, acute angled -triangle, obtuse .(angled- triangle

النهاية السابق التالى البداية

. It has( 4 (sides

. It has( 4 (angles

.It has ( 4( vertices

Like :( square, rectangle , trapezium, parallelogram, .(Rhombus

النهاية السابق التالى البداية

The number of sides of any polygon is equal to the number of its vertices and equal to. the number of its angles

Number of angles =Number of vertices. =Number of sides

النهاية السابق التالى البداية

: Is a quadrilateral in which

Only two opposite sides are parallel but not equal.in length

In each of two opposite:figure

LM // NO

النهاية السابق التالى البداية

:Is quadrilateral in which

Each two opposite sides are equal in length and.parallel

AB//CD and AD//BC

AB=CD and AD=BC

A=>C and >B=>D>

النهاية السابق التالى البداية

: Is aquadrilateral in which

Its two diagonal bisect. each other

And not equal in length

. EM =MG ,FM = MH

GE = FH , FH = GE

النهاية السابق التالى البداية

:Is a quadrilateral in which

Each two opposite side are equal in length and. parallel

. XY // LZ , ZY // LX

. XY = LZ , YZ = LX

النهاية السابق التالى البداية

Its angles are equal in. measure

Each of them are right. ((90

m(>X ( = m(>Y(=m( >Z( = m (>L(=90

النهاية السابق التالى البداية

: Is a quadrilateral in which

Each two opposite sides

.are parallel

All sides are equal in.length

SU // TR , ST // UR

النهاية السابق التالى البداية

:Is a quadrilateral in which

Its sides are equal in length

.AB=BC=CD=DA

Each two opposite sides are Parallel

AB//CD , BC //AD

النهاية السابق التالى البداية

According to its sidelength

. Isosceles triangle (1

. Equilateral triangle(2

. Scalene triangle (3

According to its measures :of angles

.Right angled_traingle(1

.Acute angled_ triangle(2

Obtuse angled_(3 .triangle

النهاية السابق التالى البداية

Has two sides equal in. length

( XY = XZ (

The Three sides equal. in length( XY = XZ = ZY (

النهاية السابق التالى البداية

Has three sides equal in.length

(XY =XZ = ZY (

Has three angles equal.in measure

(m(>X( = m(>y( = m(>Z

النهاية السابق التالى البداية

Has one right angle and. two acute angles

m(>X(=90

Has three acuteangle

البداية السابق