We have that MN ≅ QP
And since O is the midpoint of NP, NO≅OP
And since we know that MN and NP are perpendicular, and also QP and PN are too, we know that the angles formes are both right angles.
So, we know the Side(S) , angle(A), and side(A) and both sides share the right angle.
SAS ≅ SAS
