Cho hình hộp chữ nhật $ ABCD.A'B'C'D' $ .Bộ 4 điểm nào sau đây đồng phẳng?
A.$ A;B;C;C' $.
B.$ A;A';D';C' $.
C.$ B;B';D';D $.
D.$ A;C';C;D $.

Cho hình thoi $ ABCD $ có hai đường chéo $ AC $ và $ BD $ cắt nhau tại $ O $ . Biết $ AB=10cm,OA=6cm $ . Diện tích hình thoi $ ABCD $ là
A. $ 48c{{m}^{2}} $ .
B. $ 24c{{m}^{2}} $ .
C. $ 40c{{m}^{2}} $ .
D. $ 96c{{m}^{2}} $ .

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Some old _____________ in the world are really inhumane and should be stopped.
A.traditionally
B.traditions
C.traditional
D.tradition

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
‘Do you have a _____ hobby, Nick?’ ‘Yes, I like mountain climbing.’
A.difficult
B.relaxing
C.normal
D.easy

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
One of my hobbies is _____ dolls. I have a huge collection now.
A.presenting
B.receiving
C.giving
D.collecting

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
My grandmother enjoys spending her free time planting vegetables and flowers. _____ is certainly one of her interests.
A.Cooking
B.Gardening
C.Skating
D.Cycling

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Because I like dolls a lot, my parents usually ……………… me one on my birthday.
A.give
B.receive
C.collect
D.produce

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
She really likes _____ flowers. Her vases of flowers are really beautiful.
A.holding
B.cutting
C.putting
D.arranging

Cho hình thoi $ ABCD $ có cạnh dài $ 4cm $ và $ \widehat{A}={{60}^{0}} $ . Khi đó diện tích hình thoi bằng
A.$ 4\sqrt{2}\left( c{{m}^{2}} \right) $.
B.$ 8\sqrt{3}\left( c{{m}^{2}} \right) $.
C.$ 3\sqrt{6}\left( c{{m}^{2}} \right) $.
D.$ 4\sqrt{3}\left( c{{m}^{2}} \right) $.

Hình thoi có độ dài hai đường chéo là $ 6cm $ và $ 8cm $ . Tính độ dài đường cao của hình thoi.
A. $ 9,6cm $ .
B. $ 5,4cm $ .
C. $ 3,6cm $ .
D. $ 4,8cm $ .