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The formula for circumference:  C  =  pi · diameter.

                                                   C  =  pi · 28 feet

                                                   C  =  87.965 feet

 

Since PS is a diameter, arc(ST)  =  180^o - 125^o  =  55^o

So, arc(ST), in feet, will be  (55/360) · 87.965 feet  =  13.4 feet

 

Arc(RPT)  =  360^o - arc(RS) - arc(ST)  =  360^o - 97^o - 55^o  =  208^o

Arc(RPT, in feet, will be (208/360) · 87.965 feet  =  .........