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Cos Case Concern (Posted on 2015-12-06) Difficulty: 3 of 5
O is the center of a circle. AB, CD and EF are three parallel chords of this circle having respective lengths 2, 3 and 4.
It is known that ∠AOB = m, ∠COD = n and, ∠EOF = m+n, where m+n < 180o

Determine cos m

No Solution Yet Submitted by K Sengupta    
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re(2): Two solutions Comment 4 of 4 |
(In reply to re: Two solutions by Charlie)

I agree that in an acute triangle the central angles would sum to 360°. The 2-3-4 triangle, however, is obtuse.  
  Posted by Jer on 2015-12-06 20:04:43

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