RO

AO

OB

all the above

O

A

B

C

2

$\sqrt{145}$

$\sqrt{17}$

74.45

$\approx\ 8.65$

$\approx5.67$

A segment whose endpoints are on a circle.

An angle whose vertex is the center of a circle.

The point from which all points on a circle are equidistant.

Two endpoints on a circle and all of the points on the circle between those two endpoints.

180 $\degree$

$360\degree$

$90\degree$

270 $\degree$

the same as a radius

the same as a diameter

a line segment connecting two points on the circumference of a circle

a line segment with one point on the circumference and the other point at the center