You can use SAS since you know one pair of sides are congruent and AC splits them so those must make those sides equal. And since those sides, DC and BC, are congruent, the angles must be as well. You can use numbers to prove the angles of D and B or just use that when 2 sides and an angle are congruent, the 3rd side must be congruent.
(x+y-3)(x+y+3) = x^2+xy+3x+xy+y^2+3y-3x-3y-9 = -9+x^2+y^2+2xy
<span>I really don't kno but if you use quizzlet it will have the answer you are looking for</span>
Answer:
the full answer is 17.92, so that would round up to 18
Step-by-step explanation:
:)
