Question

What is m?

128°
173°
192°
256°

Answer 1

The answer is 173 degrees

Answer 2

the question is

What is the measure of the arc PO?

we know that

The measure of the external angle is the semidifference of the arcs that it covers.

so

m∠MNO=
`(1)/(2) *(arcPO-arcMO)`

`45=(1)/(2) *(arcPO-83)\\ 90+83=arcPO\\ arcPO=173\ degrees`

therefore

the answer is

the measure of the arc PO is equal to
`173\ degrees`