Question

In circle p, what is the measure of AB

Answer 1

Hello there!
Angle <AB is a perfect 90° angle. Same goes for angle <BC.
Hope I helped!

Answer 2

`arc\ AB=90\°`

Explanation:

we know that

In this problem

The measure of the arc AB is equal to the measure of angle APB, by central angle

so

`arc\ AB=m<APB` ------> by central angle

we have

`m<APB=90\°` ------> because is a right angle

therefore

`arc\ AB=90\°`