Предмет: Геометрия, автор: petrovich22901

помогите пожалуйста
С ОБЪЯСНЕНИЕМ ​

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Ответы

Автор ответа: maksim200771
1

Ответ:

60°

Объяснение:

1) мы знаем, что сторона, лежащая против 30° равна половине гипатенузы. мы видим что CD=1/2 AD. мы понимаем, что угол САD =30°

2) угол B =углу D = 90 - 30°= 60° (углы равны т.к треугольник равнобедренный)

или можно так:

180- (90+30) = 180-120 =60 (не знаю как вас в школе учат)


petrovich22901: спасибо
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I. Complete the sentences using the verbs in Present Simple or Present Continuous.
1. I ____________________(to write) a composition now.
2. They _________________(not to drink) milk at the moment.
3. Nick always ____________(to go) for a walk after dinner.
4. I _____________________(not to go) to the theatre every Sunday.
5. _________you __________(to play) now?
6. _________Ann _________(to work) at an office on Sundays?
7. Listen! Who ____________(to play) the piano in the next room?
8. I usually ________(to drive) to my work, but now I ___________(to go) by bus.

II. Complete the sentences using the verbs in Past Simple.
1. He _____________________(to get) up at 7 o’clock yesterday.
2. My friend didn’t __________(to drink) tea.
3. Yesterday I __________(to go) to the zoo and _________(to see) many animals.
4. Did you _________________(to meet) John last week?
5. Mary ___________________(to cook) soup 3 hours ago.

III. Make up sentences in Present Perfect.
1. has, She, a dress, bought. __________________________________________
2. eaten, I, have, ice-cream, tasty. _____________________________________
3. Have, to, been, you, the USA?___________________________________
4. He, yet, come, hasn’t. ___________________________________________
5. abroad, We, been, have. ____________________________________________

IV. Complete the sentences using an adjective or an adverb.
1. Small children can be very _________________(noisy / noisily).
2. My American friend speaks too _____________ (quick / quickly).
3. This text is ___________________ (easy / easily).
4. I can ________________________ do this exercise (easy / easily)/
5. Be _________________ , please (careful / carefully).

V. Put the verbs in brackets into Present, Past или Future Simple Passive.
1. I _________________(to give) a very interesting book at the library last Friday.
2. Many houses __________________(to build) in our town every year.
3. This work ____________________(to do) tomorrow.
4. The story ____________________(to write) by my friend every evening.
5. Radio _______________________(to invent) by Popov in Russia.