The altitude (,) of a right circular cylinder is always equal to the diameter (a) of the base. Find the rate of change of the volume (v) of the right circular cylinder with respect to the radius (r) of the base when the altitude changes from 4 cm to 6 cm. O 197 cm³/cm O 387 cm³/cm O 157 cm³/cm O 307 cm³/cm

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