Technical information
Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: SI DUES RECTES DE VECTORS DIRECTORS (A,B) I (C,D) SÓN PERPENDICULARS, {ad-bc; ac+bd} = 0.
Right answer summary: part 1: ac+bd
Question state: todo
Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: SI DUES RECTES DE VECTORS DIRECTORS (A,B) I (C,D) SÓN PERPENDICULARS, {ad-bc; ac+bd} = 0.
Right answer summary: part 1: ac+bd
Question state: todo