41:CongruentFigures
CongruentFigures
CongruentPolygons
Havecongruentcorrespondingparts
Mustlistcorrespondingverticesinthesame
orderwhennaming.
CongruenceStatement
ABCD EFGH
B
A
D
AB EF
F
E
C
G
H
BC
8.3 Areas of Irregular Regions
To find the area of an irregular figure (ex: a lake)
1. Count the number of squares on the interior that are completely covered
a.
I = inside squares
2. Count the number
4-7:Overlapping Triangles
A
B
C
F
D
E
Howmanytrianglesdoyouseeinthefigure
above?
4
Namethetrianglesinthefigureabove?
ADC , BFD, ABE & CFE
1
OverlappingFigures
Figuresthathavesomepartoftheirinteriorin
8.1 Perimeter Formulas Notes
Perimeter sum of the lengths of the sides of a polygon [sum = addition]
Lets look at specific figures we have already used in the past.
Rectangle
Perimeter has to do with
8.2 Fundamental Properties of Area
Area Postulate
(a) Uniqueness Property every polygonal region has a unique (one) area
(b) Rectangle Formula the area of a rectangle with dimensions l and w is A=lw
(
Geometry
Chapter 6.4
Medians and Altitudes
A median of a triangle is a segment that runs from one vertex of the triangle to the midpoint of the opposite side. The
point of concurrency of the medians i
4-5:Isosceles and
Equilateral Triangles
PropertiesofIsoscelesTriangles
Vertex
Leg
Vertex:
themeetingofthe
twoequallegs
Leg
Base:
oppositevertex
angle
Base
Angle
Base
Base
Angle
BaseAngles:
oppositethe