1)
∠ СДА равен 180°-130°=50°
Центральный ∠АОС опирающийся на дугу АВС, равен двум углам СДА и равен 100°
По условию ∠ САД равен 79°
Центральный∠ СОД равен 79° ·2=158°
Так как окружность содержит 360°, центральный
∠ АОД равен 360°-100° -158°=102°
∠ АВД опирается на ту же дугу, что и ∠ АОД, поэтому равен его половине:
∠АВД=102°:2=51°
2)биссектрисы e и d делят внутренние накрест лежащие углы (которые равны) на 4 равных угла, 2 из которых являются также внутренними накрест лежащими для прямых e и d и секущей с. из равенства этих углов следует, что прямые e и d параллельны.
returned it to the library. 3. I learned that the owner sold her only child.
sneak into Canada. 4. Be careful when crossing the street. 5. Leaving things in the wardrobe, you get
number. 6. Felt that Kerry was worried, Druet went backstage to cheer her up. 7. The boy
having lost parents, he was placed in an orphanage. 8. Returning with guests from the hunt, Cyril
Dubrovsky grabbed about him. 9. Pacing heavy
He glanced out the window and stopped at the three.
10. "Hello, Mademoiselle Mescherskaya," she said in French, she does not look up from her knitting.
11. Words that I spoke about this in advance. 12. She
someone is moaning. 13. He looked at a boy sitting on a chair in
garden. 14. He quietly dozed off, sitting in a chair under a tree. 15. After kissing the children, she went to work.
16. Molly, ironing clothes in the living room, had already gone down to the kitchen. 17. Looking down, he saw his
son with friends. 18. They are talking.