A hoop is resting vertically at staircase as shown in the diagram. AB = 12 cm and BC = 8 cm. The radius of the hoop is _____.
A 13 cm
B 
cm
C 14 cm
D 
cm
A hoop is resting vertically at staircase as shown in the diagram. AB = 12 cm and BC = 8 cm. The radius of the hoop is _____.
A 13 cm
B cm
C 14 cm
D cm