Cho đường tròn (O). Từ một điểm M ở ngoài (O), vẽ hai tiếp tuyến MA và MB (A, B là tiếp điểm) sao cho góc A M B ^ = 60 0 . Biết chu vi tam giác MAB là 18 cm, tính độ dài dây AB

Beavers have been known to use logs, branches, rocks, and mud to build dams that are more than a thousand _______.

A. lengthy feet

B. feet long 

C. long feet 

D. foot in length

______ through a telescope, Venus appears to go through changes in size and shape.

A. It has seen

B. It is seen

C. When seen

D. Seeing

Từ điểm A ở ngoài đường tròn (O; R) kẻ hai tiếp tuyến AB, AC (với B và C là các tiếp điểm). Kẻ BE ⊥ AC và CF ⊥ AB (E ∈ AC, F ∈ AB), BE và CF cắt nhau tại H

a, Chứng minh tứ giác BOCH là hình thoi

b, Chứng minh ba điểm A, H, O thẳng hàng

c, Xác định vị trí điểm A để H nằm trên (O)

Mark the letter A, B, C, or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

A. unchangeable

B. adjustable

C. emotional

D. privilege

Giải phương trình :  x 3 − 4 3 = ( x 2 + 4 ) 2 3 + 4 2 .

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. page

B. face

C. date

D. map

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

"If I were you, I would never turn the television up late at night" the man told his daughter.

A. The man wished his daughter didn't turn the television up late at night

B. The man ordered his daughter not to turn the television up when it's late at night.

C. The father said if he was his daughter, he would turn the television down at night.

D. The father advised his daughter not to turn the television up late at night.