document.write( "Question 1079744: Solutions for determining parallelograms \n" ); document.write( "

Algebra.Com's Answer #693974 by ikleyn(53763) $\"\"$ $\"About$

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\n" ); document.write( "See the lessons in this site \r
\n" ); document.write( "\n" ); document.write( "    - HOW TO prove that two vectors in a coordinate plane are perpendicular\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO prove that a triangle in a coordinate plane is a right triangle\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO check if a quadrilateral in a coordinate plane is a parallelogram\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO check if a quadrilateral in a coordinate plane is a rectangle\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO check if a quadrilateral in a coordinate plane is a rhombus\r
\n" ); document.write( "\n" ); document.write( "    - HOW TO check if a quadrilateral in a coordinate plane is a square\r
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