Question 551309
Always draw out the problem:


{{{drawing(300,300,-10,10,-10,10,


line(-8,-6,0,5),
line(0,5,8,-6),
line(0,5,0,-2),
line(-8,-6,0,-2),
line(8,-6,0,-2),
locate(0,5,P),
locate(0,-2,Q),
locate(-8,-6,S),
locate(8,-6,T)

)
}}}


By the side-angle-side (SAS) postulate, triangles SPQ and TPQ are congruent. This automatically implies angles PSQ and TPQ are congruent.