Put the verbs in the brackets into correct tense, active or passive
1. The burglars (catch) as they(leave) the office
The postboxalways (empty) at 12 midday
Aunt Mary is terribly upset. Her cat (miss) for three days now.
We (drive) down a quiet country lane when suddenly we (overtake)by a police car.
When I woke up this morning, the world looked magical. It(snow) all night.
6. When you (arrive) in New York, you (pick up) by one of our drivers and taken to the conference center.
Put the verbs in brackets into the present perfect simple or continuous
I (play) tennis all morning and I'm really tired
2.Please drive carefully to work (snow) and the roads are very dangerous.
How faryou(travel) this morning?
Kay and Bruno(live) in London for the past five years. Recently they
(try) to buy a house in the country ,but they(not manage) to sell their flat yet.
Jill and Andy(argue) a lot recently, because Jill's always going out with her friends.
I (eat) so much ice-cream, I feel sick.
The trains (run) late all morning.
Cecilia (cry) all day because she (fail) all her exams.
I (sunbathe) all morning, and now I've got sunburn.
Пусть данный ΔАВС, ∟A = 60 °, ∟B = 70 °, АВ = 2 см, AD = 1 см.
Найдем углы ΔBDC.
В ΔABD проведем медиану DK.
АК = КВ = 1 / 2АВ = 2: 2 = 1 см.
Рассмотрим ΔAKD - piвнобедрений (AD = АК = 1 см),
Если ∟A = 60 °, то ΔAKD - piвносторонний.
Итак, AD = АК = KD, ∟А = ∟AКD = ∟KDA = 60 °.
∟ВКD i ∟AKD - смежные, тогда ∟BKD + ∟AKD = 180 °.
∟BKD = 180 ° - 60 ° = 120 °.
ΔBKD - равнобедренный (KB = KD = 1 см), тогда
∟KBD = ∟KDB = (180 ° - 120 °): 2 = 30 °.
Рассмотрим ΔАВС:
∟A + ∟B + ∟C = 180 °. ∟C = 180 ° - (60 ° + 70 °); ∟C = 50 °.
∟B = ∟KBD + ∟DBC; ∟DBC = 70 ° - 30 ° = 40 °.
Рассмотрим ΔBDC:
∟DBC + ∟C + ∟BDC = 180 °.
40 ° + 50 ° + ∟BDC = 180 °. ∟BDC = 180 ° - 90 ° = 90 °.
Biдповидь: ∟BDC = 90 °; ∟DBC = 40 °; ∟C = 50 °
Объяснение: