∆PRS is an exterior angel of ∆PQR.
so from the theorem of remote interior angel .
∆PQR=∆PQR+∆PQR
=40°+30°
=70°
In ∆RTS
∆TRS+∆RTS+∆TSR=.............sum of all angel of a triangle
.: ........+∆RTS+..........=180°
.:∆RST+90°=180°
.:∆RTS=...........
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Answer:
Answer :-Angle RTS = 90°
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