perplexus.info :: Just Math : Given Ratio, Find Sum

Given Ratio, Find Sum (Posted on 2008-01-21)

For a triangle ABC, Area/R=4. Find acosA+bcosB+ccosC.
Note:R is circumradius of triangle ABC.

See The Solution Submitted by Praneeth

Rating: 4.0000 (1 votes)

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Playing around with Geometer's Sketchpad (spoiler)

| Comment 1 of 5

gives an answer of 8.

No proof though.

Posted by Charlie on 2008-01-21 11:53:58

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