Study the diagram of circle A,

where BC¯¯¯¯¯¯¯¯
is tangent to circle A
at point C.
Also, BC=3,
BA=5,
and AC¯¯¯¯¯¯¯¯
is a radius.

The diagram as described in the problem. What is the length of the radius, r?
Responses

2.5
2 point 5

1.5
1 point 5

4
4

2