If the radius of a sphere is increased by 2 cm, then its surface area increased by 352 cm². The radius of the sphere before the increase was :

If the radius of a sphere is increased by 2 cm, then its surface ar

1.	If the radius of a sphere is increased by 2 cm, then its surface area increased by 352 cm². The radius of the sphere before the increase was :
A.	6 cm
B.	9 cm
C.	12 cm
D.	15 cm
Answer» B. 9 cm

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If the radius of a sphere is increased by 2 cm, then its surface area increased by 352 cm². The radius of the sphere before the increase was :

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