Основание AC равнобедренного треугольника ABC равно 12. Окружность радиуса 9 с центром вне этого треугольника касается продолжения боковых сторон треугольника и касается основания AC в его середине. Найдите радиус окружности, вписанной в треугольник ABC.

Заполните пропуски предлогами.

1. Please take that long pencil ...your brief-case, Nick, and put it ...the table. 2. The black pen is ...the table, the brown pen is ...my bag. The red pencil is ...that book. 3. Please take these books ...the table. 4. Please go ...the blackboard. 5. Please close your book and put it ...your brief-case. It's ...your brief-case now. 6. Please go ...thedoor and close it. 7. Please put a spoon ...your cup, Ben. 8. Please go ...the room. 9. Please yake a pen ...that student. 10. Fred is ...his room now. 11. Please take your pen ...the table and put it ...your bag, Jane. Now please take it ...your bag and put it ...the book. 12. Please go ...your table and take your book ...your bag. 13. Please look ...the blackboard. Please go ...the blackboard. 14. Please take the cup ...Jane and put ...the table.