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This problem is trying to test the concept of height in triangles.

Area=b*h/2

base is clearly always 1 because no matter where the edge on the L line is, the base will still be AB

Now, we need to know that the height of a triangle is always the perpendicular distance to the base.

If you project any point on L to the base, you will realize that the distance is always the same (5)

Therefore the answer is b*h/2=1*5/2=2.5

Option B
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