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

Answer:

$arc\ AB=90\°$

Step-by-step 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

$arc\ AB=90\°$