Ina triangle ABC, show that the sides a, b, c are in A.P. if and only if r1, r2, r3 are
are in H.P.
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ყσυɾ αɳʂɯҽɾ ɾҽϝҽɾʂ ƚσ ƚԋҽ αƚƚαƈԋɱҽɳƚ.
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