polygon – a closed many straight-sided figure
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Polygon – a closed many straight-sided figure.
Angle – is a figure formed by two non-collinear rays that meet at a common end point.
Degree – a unit of measurement of an angle or arc, represented by the symbol º.
120º
DefinitionRight Angle – an angle whose measure is exactly 90°.Also define as an angle formed by 2 perpendicular lines.
DefinitionPerpendicular lines– are two lines intersecting at right angles.
For example,ray EP & ray ET.
P
E T
parallelogramrectangle
rhombus square
trapezoid
Quadrilateral – it refers to any four-sided figure.
a polygon with 4 angles and 4 straight sides.
You can name a quadrilateral the right as:
ROSE or OSER or SERO or EROS
Or RESO or ESOR or SORE
But not,ROES or OESR or
SEOR or ERSO
A quadrilateral has the following parts:
4 sides4 vertices4 angles2 diagonals
Take a look at quadrilateral LOVE.
L O
E V
The sides are: LO, OV ,VE ,EL
Take a look at quadrilateral LOVE.
L O
E V
The vertices are: L, O ,V ,E
Take a look at quadrilateral LOVE.
L O
E V
The angles are: L, O ,V , E
Take a look at quadrilateral LOVE.
L O
E V
The diagonals are: LV & OE
Take a look at quadrilateral LOVE.
L O
E V
The consecutive sides are: LE & LO LO & OV ,OV &VE , VE & EL
Consecutive sidesConsecutive sides: two : two sides with a common sides with a common endpointendpoint
L O
E V
The opposite sides are: LO & EV , OV & LE
Opposite sidesOpposite sides: two : two sides with no common sides with no common endpointendpoint
Consecutive angles- two angles with a common side.
L O
E V
The consecutive angles are: L & E L & O , O & V , V& E
Opposite angles- two angles with no common side.
L O
E V
The opposite angles are:L & V , O & E
Consecutive vertices- two vertices with a common side.
L O
E V
The consecutive vertices are: L & E L & O , O & V , V& E
Opposite vertices- two vertices with no common side.
L O
E V
The opposite vertices are:L & V , O & E
Name the following parts:- 2 pairs of opposite sides- 4 pairs of consecutive vertices-4 pairs of consecutive angles
K I
ND
The sum of all the angles equals 360º degrees.A
mA+ mB +mC + mD =360
B C
D
The sum of all the angles equals 360º degrees.
90º
90º
90º
90º
90º90º90º90º+
360º
The sum of all the angles equals 360º degrees.
Copyright © 2000 by Monica Yuskaitis
90º
90º
90º
90º
90º90º90º90º+
360º
The sum of all the angles equals 360º degrees.
70º
110º
70º
110º
70º70º
110º110º+360º
The sum of all the angles equals 360º degrees.
65º
115º65º
115º
65º65º
115º115º+360º
90º
90º
90º
?
90º90º90º
?360º
+
70º
?
70º
110º
70º70º
110º?+
360º
65º
115º65º
?65º65º
115º?+
360º
90º
90º
?
90º
90º90º90º
?+360º
58º81º
109º?+
360º81º58º
109º?
Copyright © 2000 by Monica Yuskaitis
trapezium
No parallel sides
Answer each question as indicated.
What is a quadrilateral?
Answer each question as indicated.
What is the sum measures of the interior angles of a quadrilateral?
Answer: 360
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