find the circumstance of a circle whose radius is 7ab-7bc-14ac
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=>circumference of circle=2 pi r
=>radius= 7ab-7bc-14ac
=>2x22/7x(7ab-7bc-14ac)
=>22x22/7x7(ab-bc-2ac) take the like terms
=>44/7x7(ab-bc-2ac)
=>66a2 b2c
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