Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class
Finding rate of change
Ex 6.1, 1
Ex 6.1,17 (MCQ) You are here
Example 5
Ex 6.1,15 Important
Example 6
Ex 6.1,16
Ex 6.1, 18 (MCQ) Important
Example 2
Ex 6.1,2
Example 35
Example 3
Ex 6.1,5 Important
Ex 6.1,3
Ex 6.1,6
Ex 6.1,12
Ex 6.1,13 Important
Misc 16 (MCQ)
Ex 6.1,14
Example 31 Important
Ex 6.1,4 Important
Example 30 Important
Example 4 Important
Ex 6.1,7
Ex 6.1,8
Ex 6.1,9
Ex 6.1,11 Important
Misc 2 Important
Ex 6.1,10 Important
Example 32 Important
Finding rate of change
Last updated at May 29, 2023 by Teachoo
Ex 6.1, 17 The rate of change of the area of a circle with respect to its radius r at r = 6 cm is (A) 10๐ (B) 12๐ (C) 8๐ (D) 11๐Let r be the radius of circle & A be the area of circle We need to find Rate of change of Area of circle w.r.t to radius at ๐ = 6 i.e. we need to find ๐ ๐จ/๐ ๐ at ๐ = 6 We know that Area of circle = A = ๐ ๐^2 Differentiating w.r.t ๐ ๐๐ด/๐๐=๐(๐๐^2 )/๐๐ ๐๐ด/๐๐=๐ ๐(๐^2 )/๐๐ ๐๐ด/๐๐=๐ . 2r ๐ ๐จ/๐ ๐=๐๐ ๐ Putting ๐ = 6 ใ๐๐ด/๐๐โใ_(๐ = 6" " )=2๐(6) ใ๐๐ด/๐๐โใ_(๐ = 6" " )=๐๐๐ Hence, Correct answer is B