In circle o, central angle aob has a measure of 90°. which of the following is not true? segment oa is a radius segments oa and ob are perpendicular arc ab is a semicircle

Arc AB is a semicircle, Not true.

Step-by-step explanation:

In circle O, central angle AOB has measure of 90°

We need to choose statement which is not true. We can see the attachment to shape of circle.  

As we can see O is the center of circle. A and B are two points on circle.  

So, OA and OB must be radius of this circle.  

1) Segment OA is a radius ( TRUE )

2) Segment OA and OB are perpendicular (TRUE)

Because central angle makes 90°  

3) arc AB is a semicircle (FALSE)

Because AOB is not 180°

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answer: x=60