find the radius of a circle whose perimeter is equal to the sum of perimeters of two circles having radius 7 cm and 5 cm respectively
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sum of perimeter of two circles with radius 7 cm and 5 cm is,
=> 2π ( 7 + 5)
=> 24π
therefore perimeter of new circle is 24π
perimeter = 2πr
24π = 2πr
=> 12 = r
therefore radius of the new circle is 12 cm
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