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Class: 12
Subject: Math
Topic: Rate of Change
Question:
The rate of change of the area of a circle with respect to its radius \( r \) at \( r = 6\;\text{cm} \) is: (A) \( 10\pi \) (B) \( 12\pi \) (C) \( 8\pi \) (D) \( 12\pi \)