Now , if S , S ,, S2 , S3 be the sum of the squares of the radii of the inscribed and escribed circles of the triangles ABC , APB , BPC , CPA respectively , then ( Diary , ' Quest . 1699 ) S4D2 - a2 — b2 — c2 .
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ISBN: OXFORD:555078159
Category: Almanacs, English
Page: 492
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