Answer:
0.8 radian
Step-by-step explanation:
Arc length formula: s = r(theta). This can be solved for the central angle, theta: theta = s / r. Subbing 7.2 cm for the arc length (s) and 9 cm for the radius, we get theta = s / r = (7.2 cm) / (9 cm) = 0.8 radian