SOLUTION: Point M is chosen random inside the big circle The radii of the small, middle and big circles are 4 cm, 7 cm, 10 cm respectively. What is the probability that a. Point M will be

Question 1120214: Point M is chosen random inside the big circle The radii of the small, middle and big circles are 4 cm, 7 cm, 10 cm respectively. What is the probability that
a. Point M will be in the part C ?
b. Point M will be in the part B ?
c. Point M will be in the part A ?
image here:
http://homework.russianschool.com/resource?key=52745jgxxhu6i
Answer by ikleyn(52832) (Show Source): You can put this solution on YOUR website!
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Point M is chosen random inside the big circle The radii of the small, middle and big circles are 4 cm, 7 cm, 10 cm respectively.
What is the probability that
a. Point M will be in the part C ?
b. Point M will be in the part B ?
c. Point M will be in the part A ?
image here:
http://homework.russianschool.com/resource?key=52745jgxxhu6i
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a. Point M will be in the part C ?     The probability =  =  =  = 0.16 = 16%

b. Point M will be in the part B ?     The probability =  =  =  = 0.49 = 49%.

c. Point M will be in the part A ?     The probability = 1 = 100%.

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Comment from student: thank you for helping with problem a. however, i believe problem b & c are incorrect?
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My responce: From my name (referring to me) say to the teachers in your school that they INACCURATELY formulate the problem.

The accurate formulation must say that B is the part of the middle circle which is not in A. From your post, I read it differently.

Same for the part c.

I respect "Russian Math school" very much, but in this case they are not correct . . .

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