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1-3: postulates. 1-3: Postulates. Postulate : A fact about geometry that is accepted as true Postulate 1-1 : Two points determine a unique line. Postulate 1-2 : If two distinct lines intersect, then their intersection is a point. - PowerPoint PPT Presentation
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POSTULATE: A FACT ABOUT GEOMETRY THAT IS ACCEPTED AS TRUE
Postulate 1-1: Two points determine a unique line.
Postulate 1-2: If two distinct lines intersect, then their intersection is a point.
Postulate 1-3: Three noncollinear points determine a unique plane.
ExamplePoints Q, R, S, and T are noncollinear. Name
all of the different lines that can be drawn through these points.
Name the intersection of QR and RS
Q
R
S
T
Point R
QR, QS, QT, RS, RT, and ST
ExampleName all the planes that are represented in
the figure below. Planes
A B
C
D E
F
ABCACDBCEDEFABD
Postulate 1-4: If two distinct planes intersect, then their intersection is a line.
ExampleThe figure shows the intersection of six
planes. Name the intersection of planes CDG and BCD
Name the two planes thatintersect in BA.
A
B D
C H
G
F
E
CD
Planes ABC and ABE
AssignmentWorksheet