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 List of Puzzles List of Solutions Christmas Puzzle 17.  CHRISTMAS TREES In a open field, there are 5 christmas trees decorated with colors.  The red christmas tree and the orange christmas tree are 10 yards apart.   The yellow christmas tree is 12 yards from the red christmas tree.  The blue christmas tree is 14 yards from the orange tree.  The pink christmas tree is 17 yards from the blue christmas tree.  The yellow christmas tree and the orange christmas tree are 9 yards apart.  The yellow christmas tree and the pink christmas tree are 13 yards apart.  The pink christmas tree and the orange christmas tree are 11 yards apart.  How far is is blue christmas tree from the red christmas tree (rounded to the nearest yard)?    This problem may be solved using the cosine law for triangles, which is.                   a2 = b2 + c2 - 2 b c cos(A) where a, b, and c are the length of the sides of the triangle, and angle A is the angle opposite side A. The problem can be drawn into a diagram as follows Solving for angle ROY, we let a=10, b=9, and c = 12, and angle ROY is 78.1 degrees. Solving for angle POY, we let a=11, b=9, and c = 13, and angle POY is 80.4 degrees. Solving for angle POB, we let a=11, b=14, and c = 17, and angle POB is 84.8 degrees. Angle ROB is therefore 360-angle ROY- angle POY - angle POB and is 116.7 Solving for distance RB, we let b=10, c=14, and A=angle ROB, and we get distance RB as 20.54 So the distance between the RED tree and the Blue tree is approximately 21 yards. Support this site

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Christmas is not a time nor a season, but a state of mind.  To cherish peace and goodwill, to be plenteous in mercy, is to have the real spirit of Christmas.

Calvin Coolidge

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