document.write( "Question 1039143: The perimeter of a triangular field is 240dm. It two of its sides are 78dm and 50dm,find the length of the perpendicular on the side of length 50dm from the opposite vertex. \n" ); document.write( "
Algebra.Com's Answer #653880 by ikleyn(52879)\"\" \"About 
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\n" ); document.write( "The perimeter of a triangular field is 240dm. It two of its sides are 78dm and 50dm,
\n" ); document.write( "find the length of the perpendicular on the side of length 50dm from the opposite vertex.
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\n" ); document.write( "\n" ); document.write( "First find the third side dimension from the given perimeter and two other sides.\r
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\n" ); document.write( "\n" ); document.write( "Next find the area of the triangle based on its three side lengths using the Heron's formula.\r
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\n" ); document.write( "\n" ); document.write( "Then find the unknown altitude of the triangle via its area.\r
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\n" ); document.write( "\n" ); document.write( "    - Proof of the Heron's formula for the area of a triangle, \r
\n" ); document.write( "\n" ); document.write( "    - One more proof of the Heron's formula for the area of a triangle, \r
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