document.write( "Question 1130861: What is a line segment joining two sides of a polygon? \n" ); document.write( "
Algebra.Com's Answer #747474 by MathLover1(20849)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "A line segment joining two adjacent vertices of a polygon is called an\"+edge\". A line segment joining two non-adjacent vertices is called a \"diagonal\".\r
\n" ); document.write( "\n" ); document.write( "Sometimes you need to find the point that is exactly between two other points. This middle point is called the \"\"midpoint\"\". By definition, a \"midpoint\" of a line segment is the point on that line segment that \"divides\" the\"+segment\" in two \"congruent\"\"+segments\".\r
\n" ); document.write( "\n" ); document.write( "If the end points of a line segment is (\"x%5B1%5D\", \"y%5B1%5D\") and (\"x%5B2%5D\", \"y%5B2%5D\") then the midpoint of the line segment has the coordinates:\r
\n" ); document.write( "\n" ); document.write( "(\"%28x%5B1%5D%2Bx%5B2%5D%29%2F2\",\"%28y%5B1%5D%2By%5B2%5D%29%2F2\")\r
\n" ); document.write( "\n" ); document.write( "In a triangle, the \"midline\" joining the midpoints of two sides is parallel to the third side and half as long. Conversely, the line joining points on two sides of a triangle, parallel to its third side and half as long is a \"midline\". \r
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