<PRE><B>Question 1120549</B>
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Assuming the boats will be centered in the channel, the width of the boat will be 2x, where x is the other leg of a right triangle with one leg 3 (the depth of the boat in the water) and hypotenuse 6.5 (the radius of the semicircular channel.&lt;br&gt;
However, I wouldn&#39;t bother going any further with the calculations, because you have a problem.&lt;br&gt;
If the diameter of the channel is 13ft and is filled with water 6.5ft deep, then the channel is full; if you put any boats in the channel you are going to have a flood.&lt;br&gt;
Perhaps you have misstated the problem...?&lt;br&gt;
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No; I can&#39;t help you &quot;rephrase&quot; the problem, because it doesn&#39;t make sense.  The numbers you show simply don&#39;t make sense.&lt;br&gt;
If you are showing the problem EXACTLY as it was given to you, then it makes no sense, and you can&#39;t do anything with the problem.&lt;br&gt;
More likely, the numbers you have shown are not the correct numbers.&lt;br&gt;
Perhaps the channel has a RADIUS of 13ft instead of a DIAMETER of 13ft?  Then filling it to a depth of 6.5ft would make sense.</PRE>