гіпотенуза прямокутного трикутника дорівнює 21 см. знайдіть радіус описаного кола​

1.Miss Chatter got a lot postcards on her birthday. (What.....?)2. Last year hte winter was cold and snowy. (When....?) 3.Yesterday Tiny wrote a Christmans card to his friend Billy. (Why.....?) 4.Jills cake was tasty and nce. (Was.....?) 5.He ran very well hte day before yesterday. (How.....?)6. They lived in a small house. (Did......?)