Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Please solve RD Sharma class 12 chapter 12 Derivative as a Rate Measurer exercise multiple choise question 21 maths textbook solution

Please solve RD Sharma class 12 chapter 12 Derivative as a Rate Measurer exercise multiple choise question 21 maths textbook solution

Answers (1)

Answer:

\pi ^{2}\: cm^{2}/sec

Hint:

The circumference of a circle

A(r)=\pi r^{2} \quad \quad \quad \quad \quad .....(i)

Given:

r=\pi \mathrm{cm} \\ \frac{2 d r}{d t}=1 \mathrm{~cm} / \mathrm{sec}

Solution:

→ Differentiating (i) respect to t, we get

\frac{d A}{d t}=2 \pi r \frac{d r}{d t}=\pi \times \pi \times 1 \\ \\ =\pi^{2} \mathrm{~cm}^{2} / \mathrm{sec}

Posted by

Gurleen Kaur

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

QR Code Glitch: CBSE says Class 12 maths question paper secure, exam integrity not compromised
anam-khan

Iran-Israel Conflict: CBSE postpones Class 12 board exams 2026 till March 16 in Middle East
anam-khan

CBSE Class 12 Maths 2026 paper ‘moderate, balanced’ in difficulty; experts flag one out-of-syllabus question

Latest Question