205k views
3 votes
Air is pumped into the balloon so that it's radius doubles every 10 seconds using 3.14 as an approximation for pie , find its surface area after 30 seconds round to the nearest tenth

User Yangmei
by
7.0k points

1 Answer

5 votes

Answer:

Explanation:

Let the balloon be a sphere and surface area = ⁴/₃πR³

After 30 seconds, radius will be 4R

Let R= 1cm, After 30 seconds R = 4 cm

Hence surface area = ⁴/₃π(4R)³ = 26794667R³ = 1071.7867 cm² ≅ 1070 cm²

User HexaJer
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories