NCERT Class 12 · Ch 6 Exercise 6.1 · Q6
NCERT Class 12 Maths · Chapter 6 Applications Of Derivatives · Exercise 6.1 Question 6
A circle radius increases at 0.7 cm/s. Find its circumference rate.
💡 Concept Hints
- Identify the domain and the inner and outer functions, or the relevant one-sided limits.
- Apply the appropriate differentiation or limit rule, keep all chain factors, and check exceptional points.
✅ Step-by-Step Solution
Final Answer: 1.4π cm/s.
- The circumference is L=2πr.
- Thus Lₜ=2πrₜ=2π·0.7=1.4π cm/s.
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