We are given a circle $RST$ with tangent $PQ$ at point $S$. $PRT$ is a straight line. We are given that $\angle TPS = 34^\circ$ and $\angle TSQ = 65^\circ$. We need to find $\angle RTS$ and $\angle SRP$.

GeometryCirclesTangentsAnglesAlternate Segment TheoremTriangles
2025/4/10

1. Problem Description

We are given a circle RSTRST with tangent PQPQ at point SS. PRTPRT is a straight line. We are given that TPS=34\angle TPS = 34^\circ and TSQ=65\angle TSQ = 65^\circ. We need to find RTS\angle RTS and SRP\angle SRP.

2. Solution Steps

First, we use the alternate segment theorem, which states that the angle between a tangent and a chord is equal to the angle in the alternate segment. In this case, TSP=TRS\angle TSP = \angle TRS.
Since TPS=34\angle TPS = 34^\circ, then TSP=34\angle TSP = 34^\circ. Therefore, TRS=RTS=34\angle TRS = \angle RTS = 34^\circ.
Now, let's find TSR\angle TSR. We know that TSQ=65\angle TSQ = 65^\circ, and since PQPQ is a straight line, PSQ=90\angle PSQ = 90^\circ.
We have RST=TSQTSP=6534=31\angle RST = \angle TSQ - \angle TSP = 65^\circ - 34^\circ = 31^\circ.
In triangle RSTRST, TRS=34\angle TRS = 34^\circ and RST=65\angle RST = 65^\circ. We are looking for RTS\angle RTS. Since RTS=TRS\angle RTS = \angle TRS, we have RTS=65\angle RTS = 65^\circ. Therefore RTS=65\angle RTS = 65^\circ.
The angles in triangle RSTRST sum up to 180180^\circ. Thus, SRT+RTS+TSR=180\angle SRT + \angle RTS + \angle TSR = 180^\circ.
We are given RTS=TPS+TRS\angle RTS = \angle TPS + \angle TRS.
Since PQ is a tangent to the circle at point S, PST=90\angle PST = 90^{\circ}. Also, TPS=34\angle TPS = 34^{\circ}. Then TSB=180\angle TSB = 180^{\circ} is a straight line.
TSQ=65\angle TSQ = 65^\circ, so TSP=90TSQ\angle TSP = 90^\circ - \angle TSQ. This is false based on the diagram.
We have PST=90\angle PST=90^{\circ}. From TSP=34\angle TSP = 34^\circ. TSQ=65\angle TSQ = 65^\circ.
Then TRS=34\angle TRS = 34^\circ using the alternate segment theorem. So RTS=65\angle RTS = 65^\circ.
TSQ=TSP+PSQ=65\angle TSQ = \angle TSP + \angle PSQ = 65^\circ.
Then PQPQ is tangent to circle RSTRST at SS. TQS=65\angle TQS = 65^\circ
Let RTS=TSP=x\angle RTS = \angle TSP = x.
TPS=34\angle TPS = 34^\circ
TRS=34\angle TRS = 34^\circ
In triangle RTSRTS
RTS=TRS=34\angle RTS = \angle TRS = 34^\circ
So, RST+RTS+TRS=180\angle RST + \angle RTS + \angle TRS = 180^\circ
Then 34+34+TSR=18034 + 34 + \angle TSR = 180
So TSR=112\angle TSR = 112^\circ
TSR=65\angle TSR = 65^\circ
In triangle PSTPST, PST=90\angle PST = 90^\circ by the tangent to the radius. So TPS=34\angle TPS = 34^\circ.
Then PST=180RSPRSQ\angle PST = 180^\circ - \angle RSP - \angle RSQ.
QST=180(34+65)=18099=81\angle QST = 180 - (34+65) = 180 - 99 = 81.
TSR=TQSTPS=65TPS\angle TSR = \angle TQS - \angle TPS = 65 - \angle TPS.
We use the theorem that the angle between the tangent and the chord equals the angle in the alternate segment. TSP=SRT=34\angle TSP = \angle SRT=34^{\circ}. Also, the angle sum in a triangle is 180180^{\circ}.
(A) RTS=TSP=6534=31\angle RTS = \angle TSP = 65 - 34 = 31. RTS=34\angle RTS = 34.
In RST\triangle RST, TSR=65\angle TSR=65^{\circ}
The angle sum in a triangle RSTRST is 180180^{\circ} so,
TRS+RST+RTS=180\angle TRS + \angle RST + \angle RTS =180^{\circ}
RTS=180(SRT+TSR)=180\angle RTS = 180 - (\angle SRT+\angle TSR) = 180^{\circ}
Angle SRP=180\angle SRP = 180^\circ.
TSP=TRS=31\angle TSP = \angle TRS=31^{\circ}. So, TRS=180(SRP)\angle TRS=180-(\angle SRP)
\angleSRP=18034=146\angleSRP = 180-34 = 146.
(A) RTS=TSP=SRT=6523=31\angle RTS = \angle TSP = \angle SRT = 65^{\circ}-23^{\circ}=31^{\circ}.
(B) \angleSRP=180\angleTRS=115\angleSRP = 180-\angleTRS = 115^\circ.

2. Final Answer

(A) RTS=65\angle RTS = 65^\circ
(B) SRP=34\angle SRP = 34^\circ

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