Answer:
Part 1)

Part 2)

Part 3)

Explanation:
Part 1) Find the measure of angle LOQ
we know that
-----> by central angle
we have that

so

Part 2) Find the measure of angle LRQ
we know that
The inscribed angle measures half that of the arc comprising
so

we have

substitute

Part 3) Find the measure of angle LBQ
we know that
The inscribed angle measures half that of the arc comprising
so

we have

substitute
