Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

The diameter of a sphere balloon increases from 14cm to 28cm as air is being pumped into it . find the ratio of surface areas of the balloon in to cases.

( plz help me out quickly )


Volume of sphere =  \frac{4}{3} \pi r^{3}
having initial radius as r_{1} and final radius as r_{2},

v_{1}:v_{2} =  \frac{ \frac{4}{3} \pi r_{1}^{3} }{\frac{4}{3} \pi r_{2}^{3}}
= 1:8
2 5 2
Please rate best answer
thnx for ur answer buddy :)
i have marked ur answer as best :)
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts