There are 4 ways that a right triangle may be oriented with axis-aligned catheti. So, the problem should probably ask that the angles follow a certain order, or show the triangle with labeled legs.
Reverse the vector
2 b | ~ 2 b
Is this triangle right-angled?
Find the area of the four walls
UICBioE240 problem 1.17
UICBioE240 problem 1.10
UICBioE240 problem 1.14
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