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Solution 3
Part I Make a prediction first, by looking at the picture. Area of region 1/Total area = probability of a dart landing in region 1. Because probability = desired outcome/all possible outcomes. Area of region 1= ¹r2=¹202=400¹ cm2. Total area =¹r2=¹402=1600¹ cm2. Area of region 1/Total area =400¹ cm2/1600¹ cm2=1/4=.25 Discussion: What does the answer mean? Does this answer seem reasonable? Part II Since Region 1 is 400¹ cm2 or 1/4 of the total area
of 1600¹ cm2, region 2 must be 3/4 of the area or 1200¹
cm2. So, the probability of a dart, thrown at random, landing
in region 2 is .75.
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