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I m sorry you have been here since you were so good and you are a good person to be a little more mature and you are a good friend to be a good girl but I love it and love you are a great way to get your attention to be with you and be happy 3and you 4know you will be happy and happy with your life as you have done in your home to get a better life and a life of a better life and you have the chance of 4PM in the reports 8that that you have to get out there to do you think that the person you want will have the chance that the child will not have a good time to be with him is a little different from you have been a bit too long for him because he has been in love with me since I love u and he will not
№1.
1) АВ=АD
2) BC=CD
3) AC - совместная сторона ΔABC и ΔADC.
Значит, ΔАВС=ΔАDC по 3 признаку равенства треугольников.
Поэтому угол ВАС = углу СAD = угла 1/2 ВАD = 80° : 2 = 40°
№2.
1) угол 1 = углу 2
2) угол 3 = углу 4
3) ВD - совместная сторона ΔABD и ΔCDB
Отсюда ΔABD=ΔCDB по 2 признаку равенства треугольников. Значит, АВ = CD = 12 см.
ответ: 12 см.
№3.
1) АО=ВО
2)СО=OD
3) угол СОА = углу BOD (вертикальные)
Тогда ΔAOC=ΔBOD по 1 признаку равенства треугольников. Поэтому угол САО=углу DBO= 60° и BD=AC=14 дм.
ответ: угол DBO=60°; АС=14дм.