Question 269680
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Most probably you're talking of one "diagonal" 7 and a 45deg angle.
{{{drawing(300,300,-1,10,-1,4,graph(300,300,-1,10,-1,4),line(0,0,3,2),line(3,2,9,2),line(9,2,6,0),line(6,0,0,0),green(locate(1.5,1.5,7)),green(locate(1,.5,45^o)))}}}


Then, {{{Area[R]=d^2(sin(alpha))}}}
{{{Area=7^2*sin(45)=(49)(0.707)}}}
{{{Area=34.6}}}sq.units, Answer


Thank you,
Jojo</font>