document.write( "Question 104134: The diagonal of a rectangle forms a 30 degree with one side of the rectangle. If the diagonal has measure 10, what is the area of the rectangle? \n" ); document.write( "
Algebra.Com's Answer #75854 by edjones(8007)\"\" \"About 
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The diagonal of the rectangle is the hypotenuse of a 30-60-90 degree triangle.
\n" ); document.write( "h=10
\n" ); document.write( "sin(30)=opp/10
\n" ); document.write( "opp=sin(30)*10=5
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\n" ); document.write( "cos(30)=adj/10
\n" ); document.write( "adj=cos(30)*10=8.66...
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\n" ); document.write( "A=5*8.66...=43.3013 sq units
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