The arcs given by the circle,are
.
Given that 
First determine 
(Apply arc addition theorem)
(Substitute
)
(PQ = RQ)

(Add:
)
(Subtract 120 from each side)
(Simplify)
(Divide each side by 2)
(Simplify)
(Divide:
)


(Substitute
)
(Simplify)
(Substitute
)
(Simplify)

(Substitute
)
(Simplify)
(Substitute
)
(Simplify)
(Substitute
)
(Simplify)
(Substitute
)
(Simplify)
(Substitute
)
(Simplify)
(Substitute
)
(Simplify)
The values are
,
.