Impossible?

Geometry Level 3

Given triangle A B C ABC in 4-space with points A = ( 1 , − 2 , 3 , − 4 ) , B = ( − 5 , 6 , − 7 , 8 ) , C = ( 9 , − 10 , 11 , − 12 ) A=(1,-2,3,-4), B=(-5,6,-7,8), C= (9,-10,11,-12) , angle A B C ABC can be described as

Acute Right Obtuse Impossible, you can't do this in 4D

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Hobart Pao by Hobart Pao , 23, USA

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