This question is checking to see if you remember what the three angles
of any triangle always add up to. Apparently you don't, or you would not
need to go out looking for somebody who does.
The three angles inside every triangle always add up to 180° .
If two of them add up to 135° , then that leaves
(180° - 135°) = 45° .
for the one remaining angle.
Answer:
I hope it requires the picture I have drawn.
The area of this square is 12.
The definition of a rhombus is that it's a polygon with four congruent sides. If you split one into two pieces with a diagonal, then yes, it will be two isosceles triangles because two sides are congruent.
