The perimeter of the triangle is where .
(Substitute: )
(Add: )
The standard form of the expression is .
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where ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=092690c791e80e5174ea952d05cd6d18.png\")
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)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=482f596badde9946ff249f48f4022418.png\")
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)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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.