1. Прямая АВ касается окружности с центром в точке О, А — точка касания. Найдите радиус этой окружности, если АВ = 12 см, а ВО = 13 см.
2. В треуголоьнике РТK РТ =9 см, РК = 12 см, ТK = 15 см. Докажите, что РК — отрезок касательной, проведенной из точки К к окружности с
центром в точке Т и радиусом, равным 9 см НАРИСУЙТЕ РИСУНОК И РАСПИШИТЕ С ДАНО И ТАК ДАЛЕЕ
2. He kept late hours last night, he may still (be sleeping).
3. "She must (have been) very beautiful years ago," Maren thought.
4. It's a secret, and no one else must (be told).
5. Good-bye. So pleased (to have met) you.
6. He's a talented engineer. He's supposed (to be working) at a new invention.
7. I've just seen him passing the entrance door, so he can't (be working) at the laboratory as you say.
8. The next morning he seemed (to have forgotten) it all.
9. No words can describe it: it must (be seen)
10. I hate (to brother) you, but the students are still waiting (to be given) books for their work.
11. He seized every opportunity (to appear) in public: he was so anxious (to be talked) about.