Diameters of circles

How many percent of the area of a larger circle is a smaller circle if the smaller circle has a diameter of 120 mm and a larger one has a diameter of 300 mm?

Correct answer:

p =  16 %

Step-by-step explanation:

D1=120 mm D2=300 mm r1=D1/2=120/2=60 mm r2=D2/2=300/2=150 mm S1=π r12=3.1416 60211309.7336 mm2 S2=π r22=3.1416 150270685.8347 mm2 p=S1/S2 100=11309.7336/70685.8347 100=16%



Did you find an error or inaccuracy? Feel free to write us. Thank you!







Tips for related online calculators
Our percentage calculator will help you quickly calculate various typical tasks with percentages.

You need to know the following knowledge to solve this word math problem:


 
We encourage you to watch this tutorial video on this math problem: video1

Related math problems and questions: