Найдите площадь кольца, ограниченного двумя окружностями с общим центром и радиусами 3 и 7 см.

1) I often prepare lessons with my friend. The fact that I do not know, My friend will help me.
2) I love to play with my friend in different sports. It's really fun.
3) My friend is very funny. He always jokes, over which I laugh. If I'm sad my dryg able to cheer me up.
4) My friend and I rarely talk on the English, only when the English lesson.
5) I live with my friend just a couple of stops, I do not think it's a far distance.

A. Yes I do
b. Not often.
c. I like play football with my friend. 
d. Yes he is.
e. Never.
f. Yes we do.