A garden has the boundary line $x+y=10$ (in metres). A path is drawn as the line $y=x$.
The region bounded by $x+y=10,y=x$ and the $x$-axis forms a triangle.
Its vertices are the origin O(0,0), the point where $y=x$ meets $x+y=10$, and where $x+y=10$ meets the $x$-axis.
Find the area (in square metres) of this triangle.

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