Geometric Probability
Geometry 10.8
Mr. Belanger
P(event)=
An event is any outcome that happens
when a game/experiment is done.
In terms of geometry we are thinking about shapes…
Probability of hitting a section on a dart board.
Probability of throwing the bean bag through the hole.
Probability of getting the ring on the Coke bottle.
P(event)=
are aof re giontryingto hit
P(event) = are aof wholegameboard
Ways to report answer…
Fraction
a
b
Ratio
a:b
Percent
75%
Examples:
If AD is 24 and BD is 17 what is the
probability of landing in AB?
A
B
How long is AB?
C
7
7
p
 29 %
24
D
Examples:
What is the probability of hitting the
green section?
3.5
11

3.5  3.5
p
1111
P= 10%
Examples:
What is the probability of hitting the
section of blue or anywhere inside
the blue ring?
 7 
 12 
2
P=
Radius = 7 in
Radius = 12 in
2
P = 34%
Examples:
8
10
.5  8 10  sin 30
P(triangle)=
2
5
20
 25 .5%
78 .5