aliensbrain
  • Home
  • Study
  • Quizzes
  • 🎤AI Practicefree
  • Notebooks
  • Community
  • Sign in
Multiple choice

The ratio of the radius of two circles is 5:4. What is the ratio of their areas?

  1. $5:4$
  2. $25:16$
  3. $6:7$
  4. $9:13$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Area of a circle is πr². If radii are in ratio 5:4, areas are in ratio π(5)²:π(4)² = 25:16. The ratio of areas is the square of the ratio of radii.

Keep practicing — related questions

  • A, B and C were partners sharing profits in the ratio 5 : 4 : 1. 'A' retired and new ratio was decided as 3...
  • switch(x) { default: System.out.println(Hello); } Which two are acceptable types for x? 1. byte 2. long 3. ...
  • In an election contested by two candidates, 5% of the voters did not vote. The winner won by 5100 votes sec...
  • Which two statements are equivalent? 1. 16*4 2. 16>>2 3. 16/2^2 4. 16>>>2
  • Which two statements are equivalent? 1. 3/2 2. 3<2 3. 3*4 4. 3<<2
  • Amongst chlorophyll-a (C55H72O5N4Mg) and chlorophyll-b (C55H70O6N4Mg), which one has –CHO group and which h...
  • Which of the following bacteria are examples of free-living nitrogen fixers? 1. Rhizobium 2. Beijerinckia 3...
  • Which of the following enzymes are examples of hydorlases? 1. Lactate dehydrogenase 2. Alanine deaminase 3....

Practice this chapter

  • Mensuration (2507 questions)
Advertisement
© Aliensbrain | all rights reserved
  • About
  • Contact
  • Terms and Condition
  • Privacy Policy