Geometric Figures If a point is selected at random inside a geometric figure, then the probability that the selected point lies inside a particular region is the ratio of their areas:
7 Q) F8 n+ V( j area of the particular region inside the figure/area of the whole figure.
1 k4 e0 s, ^2 D# K" k7 \ Example:
9 w6 Z- G; \, R6 f The probability that a randomly selected point within the square lies inside the circle=area of circle/area of square=∏r2/(4r2)= ∏/4
' T1 w X2 E1 {2 w9 K; q4 l0 sRemember:; S3 v) x" r: v
If the particular region is not completely inside the figure, then use only the area that is inside the figure. |
发表于 2012-8-15 12:55:17
