UPSC 2016 CDS I Math Paper

Suppose chords AB and CD of a circle intersect at a point P inside the circle. Two right-angled triangles A'P'B' and C'Q'D' are formed as shown in the figures below such that A'P' = AP, B'P' = BP, C'Q' = CP, D'Q' = DP and ∠A'P'B' = 90°= ∠C'Q'D' :

Which of the following statements arenot correct?
1. A'P'B' and C'Q'D' are similar triangles, but need not be congruent.
2. A'P'B' and C'Q'D' are congruent triangles.
3. A'P'B' and C'Q'D' are triangles of same area.
4. A'P'B' and C'Q'D' are triangles of same perimeter.
4. A'P'B' and C'Q'D' are triangles of same perimeter.