user-avatar
shynchan1111
2 năm trước
Cho tam giác ABC nhọn. Vẽ hai đường cao AE và CF (E€BC,F€AB) a) chứng minh tứ giác AFEC nội tiếp đường tròn b) chứng minh góc EFC= góc EAC c) qua b kẻ tiếp tuyến xBx'với đường tròn ngoại tiếp tam giác abc. Chứng minh xx' song song EF
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Rewrite the sentences so that it stays the same meaning. 28. “You’d better not lend that man any more money, Mary” - said John. → John advised............................................................................................................... 29. Although he took a taxi, Bill still arrived late for the concert. → Despite ........................................................................................................................ 30. It is ages since Alan visited his parents. → Alan ............................................................................................................................ 31. They manage to finish the project in time for the presentation. → They succeeded ............................................................................................................

PREPOSITIONS 1.they sent me a cheque..........50 dollars. 2.there has been some decrease.........military spending this year. 3.nobody knows what the cause........the explosion was. 4.have you ever read any books........Mark Twain? 5.It's unreasonable........you to expect her to love you at first. 6.they were furious......me.......not inviting them to the party. 7.I'm not ashmed........what i did. 8.she is engaged......an American. 9.your writing is similar......mine. 10.i always try my best to get along.......other officers. 11.why don't you apply.......a position in that company. 12.he lost control of the car and crashed........a wall. 13.he has suffered......lung cancer for ages. 14.he shouted......from the other side of the street. 15.they arrived......this station....5o'clock yesterday. 16.some fashion designers have taken inspiration.....Vuetnam's ethnic mimorities. 17.jeans have never been........fashion. 18.during the war, our country was divided........3 parts. 19.my mother has compltely made this skirt.........cotton. 20.children's shoes are often worn........very easily. 21.ao dai is the complusory uniform of women teache......work. 22.hanoi and kuala lumpur are the same.......many ways. 23..........tradition, the marriages of the girls are arranged by their parents

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team