I assume AD means AB? Well in that case then since AB = 9, then we know one side is 9. if BC is 12, then we know that ABC has a hypotenus of 13 less AC is not the longest side, of which then then missing side length is √63. If AC is the hypotenus, then the triangle has an area of 54. if the hypotenus is 12, then the area is going to be 4.5√63
I don't believe so because congruent shapes are exactly the same but a side measurement could be the same on a square and a triangle but those aren't congruent shapes