Question 976666
Here's a sketch of the region. 
Two triangles. 
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*[illustration dd5.JPG].
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One with a base of 5 and a height of 5 and one with a base of 1 and a height of 1.
{{{A=(1/2)(5)(5)+(1/2)(1)(1)}}}
{{{A=25/2+1/2}}}
{{{A=26/2}}}
{{{A=13}}}