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QUADRILATERALS. A quadrilateral is a polygon with FOUR sides. Q. R. 2. It is named by its VERTICES in a clockwise position. 1. 3. 4. S. P. *The figure above is named PQRS, QRSP, RSPQ, or SPQR. REMEMBER :The order of the vertices is important !. TERMS :. B. A. - PowerPoint PPT Presentation
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A quadrilateral is a polygon with FOUR sides. Q
S
R
P
It is named by its VERTICES in a clockwise position.
*The figure above is named PQRS, QRSP, RSPQ, or SPQR .
2
31
4
REMEMBER :The order of the vertices is important !
TERMS :
DC
B
AIn quadrilateral ABCD, the vertices are A, B, C and D.
Vertices A and B, B and C, C and D, D and A are consecutive vertices.
Vertices A and C, B and D, are opposite vertices.
A B
D C
Two sides with a common vertex, like AB and BC, are consecutive sides.
AB, and DC, AD and BC, on the other hand are opposite sides.
`
D
BA
C
Two angles with a common side, like <A and <D, are consecutive angles.
<A and <C, <B and <D, on the other hand are opposite angles.
A
B
C
D Segments joining opposite vertices like AC and BD are called diagonals of the quadrilateral.
KINDS of QUADRILATERALS :M
N
O
PQ
R S
T
CONVEXNONCONVEX
Diagonals of quadrilateral intersect.
Diagonals of quadrilateral do not intersect
TRAPEZOID
A trapezoid is a quadrilateral with exactly a pair of parallel sides.
base angles
base
base
legleg
*If the legs are congruent , trapezoid is an isosceles.
*If a quadrilateral has no parallel sides, it is called a trapezium.
Parallelogram
RhombusRectangle
Square
REMEMBER !
always alway
s
always always
sometimes
sometimessometimes
sometim
es