What is the radius of the sphere formed when a cone, originally with a height of 24 cm and a base radius of 6 cm, is reshaped using modeling clay?

a) 6 cm
b) 12 cm
c) 18 cm
d) 24 cm

Hence, calculate the surface area of the resulting sphere.

a) 144π cm²
b) 288π cm²
c) 432π cm²
d) 576π cm²