document.write( "Question 622329: are opposite rays coplanar? \n" ); document.write( "
Algebra.Com's Answer #391296 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "first, recall what is a ray and its opposite:
\n" ); document.write( "If a \"ray\" is \"half\" a line, its \"opposite\"\"+ray\" is the \"other\" half of the \"same\" line. That is, two rays are opposite rays if and only if they radiate from the same point and in opposite directions. Or, to put it another way, the angle between opposite rays is \"180\" degrees.\r
\n" ); document.write( "\n" ); document.write( "Recall that, by definition, two objects are \"coplanar\" if they \"both\" lie in the same plane. Opposite rays lie on same line; consequently, they lie in same plane too.\r
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\n" ); document.write( "\n" ); document.write( "So, they are \"coplanar\".
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