Tỷ lệ người dân nghiện thuốc lá ở một vùng là 30%. Biết rằng tỷ lệngười bị viêm họng trong số những người nghiện thuốc lá là 60%
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Point D is the midpoint of the outer circle that we aim to find the area of
The circle has a diameter of WZ and radii of WC and CZ
We know that YZ=YD=10 cm
Let DC be
and CY be 
The radius of the outer circle can be written as
or 
which we can equate to find the value of
Therefore, the radius of the circle is
And hence the area of the circle is
=324
The circle has a diameter of WZ and radii of WC and CZ
We know that YZ=YD=10 cm
Let DC be
The radius of the outer circle can be written as
Therefore, the radius of the circle is
And hence the area of the circle is