Correct Answer: Option D

Explanation

A = \(\pi\)r², \(\frac{\delta A}{\delta r}\) = 2πr

So, using \(\frac{\delta A}{\delta t}\) = \(\frac {\delta A}{\delta r}\) x \(\frac {\delta A}{\delta t}\)

= 2\(\pi\)r x 0.02

= 2\(\pi\) x 7 x 0.02

= 2 x \(\frac{22}{7}\) x 0.02

= 0.88cm²s^-1

There is an explanation video available below.

• professor John is the leader of the ________ committee to review the new book? Answer this

  1 Answers   ·   English Language   ·   3 months ago
• His contract was ---- because of irregularities in his contract You picked annulled over terminated and I want to know... Answer this

  1 Answers   ·   English Language   ·   2 months ago
• whats is the difference between phrase and clause? Answer this

  2 Answers   ·   English Language   ·   3 days ago