Changing Border Line
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Problem 1

   The land is divided into two parts (P and Q) by the border ABC. Redraw
   a straight border line passing through point A so that each of the area
   does not change. [tochia.gif]
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Applet Problem 1

       Drag the red point. Each of the areas P and Q does not change.
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Problem 2

   The land is divided into two parts (P and Q) by the border ABCD. Redraw
   a straight border line passing through point A so that each of the area
   does not change. [tochib.gif]
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Applet Problem 2

       Drag the red points. Each of the areas P and Q does not change.
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