B
Which pair of lines are skew?
CAE, DH
ET, EH
BC, CG
AG, FE
FE, BC

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation:

just get this app called photo math it should be able to do those