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.

What is the length of the radius, r?
A: 2
B: 4
C: 2.5
D: 1.5

Study the diagram of circle A where BC is tangent to circle A at point C Also BC3 BA5 and AC is a radius What is the length of the radius r A 2 B 4 C 25 D 15 class=