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four concentric circles r given .the radius of 1st circle is x.next is 2x,then 3x and 4x. given that area b/w 2nd and 1st is A and 4th and 3rd circles being B.find ratio of A to B

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.a triangle ABC is given, a line DE is parallel to base side and that cuts the triangle.. the ratio of area of triangle to the area of trapezium .given DE/BC=3/5.. difference b/w the perimeters of two concentric circles is 66.find the difference b/w radius