Тонкий резиновый шар радиусом 2 см наполнен воздухом при температуре 20 °С и нормальном атмосферном давлении. Каков будет радиус шара, если

                                                                                                  Mira street, 29
                                                                                                  (город)
                                                                                                  Russia
                                                                                                  625794
                                                                                         The twelfth of October
Dear Helen,
Thank you for your letter. I did not write you because I was ill. And thank you for your questions. I answer it with pleasure.
It is a great pity that we have not met in London. But it is very good that you had a trip in Spain. I think it was so fantastic! I had a trip in France. I had visited Eiffel tower. It was great! This tower is very beautiful. I think the Eiffel tower is the greatest sight of France.
Of cource I had shopping in the best shopes of France. There were a lot of modern clothes. I hope that I and my family will return in France for new impressions.
So I want to ask you about your trip: How did you spend your travelling? What interesting places did you see? What was your feelings or emotions?
Oh, sorry Helen, I must do my homework.
Goodbye
With best wishes
(Имя своё)