the area bounded by two concentric circle is
a-πR^2
b-π(R+r)(R-r)
c-π(R^2-r)
d-none of these
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b
area of bigger circle is πR^2
area of small circle is πr^2
area bounded by 2 circles
π(R^2-r^2)
so π(R+r)(R-r)
area of bigger circle is πR^2
area of small circle is πr^2
area bounded by 2 circles
π(R^2-r^2)
so π(R+r)(R-r)
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