Предмет: Геометрия, автор: movsisynnairj

Даю все баллы.
Пожалуйста помогите.. ​

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Ответы

Автор ответа: uselessdaffodil
3

Ответ:

1) угол АМВ=180° (развернутый угол)

угол DMC=1/2 CMB; CMB=64°•2=128°. значит, 180°-128°=52°

2) т.к. m||n, значит, угол 1= угол 4 (соответственные углы равны), значит, угол 4=65°. следовательно, рассмотрим треуг. АВС: угол 3=180°-(65°+51°)=64°

3) т.к. угол BAD=1/2• ВАС, значит, угол BAD=62°/2=31°

4)30°+45°=75°. угол BCD=BAD=75° (противолежащие углы равны)

следовательно, при параллельных прямых BC и AD и секущей AB угол АВС=180-75=105°-больший угол


movsisynnairj: Господи надеюсь ты верно решил спасибо!
Sergeusyperpro: да у него всё верно
movsisynnairj: да.. у вас всё одинаково..} только ты мне объяснение написал} благодарю!
Sergeusyperpro: не за что обращайтесь
Автор ответа: Sergeusyperpro
2

Ответ:

1)52   2)64   3)31   4)105

Объяснение:

1)Нам известно из дано что MD-бесектриса а как известно бисектриса делит угол пополам следавательно угол CMB=128 градусов. Дальше мы знаем что у развёрнутого угла максимально допустимый градус 180 градусов следовательно 180-128=угол CMA=52

2)по теореме нам известно что угол находящийся между 1 и 3 равен накрест лежащему а дальше мы действуем по теореме развёрнутого угла как из первой задачки 65+51=116; 180-116=угол 3=64

3)AD-бесектриса следовательно она делит угол по полам 62/2=31

4)снова действуем по теореме накрест лежащих углов получается что угол А и угол С=75градусам дальше мы знаем что сумма всех углов не может превышать или быть меньше чем 360 градусов следовательно 75+75=150; 360-150=210; 210/2=105

Пояснение: мы разделили на т.к. у нас осталось ещё два не известных угла но они равны между собой получилось что самые большие углы это S и D

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Предмет: Математика, автор: 25tajna