高中 解答

已知一個三角形其中的兩邊長分別為 6 公分和 9 公分,此兩邊的夾角為 120°,今將此三 角形影印縮放成 200%,則下列關於新三角形的敘述何者錯誤?

△ABC 中,∠A=90°, AB =12, BC =15,今將△ABC 影印得縮放圖△A'B'C',且 AB 的對應邊 A'B' =9,則 AC 的對應邊 A'C' =? 27 27

萍萍的房間長 4.5 公尺,寬 3.5 公尺,她的床長 2.5 公尺,寬 1.5 公尺,則附圖為房間的 幾倍縮放圖? 4.5 公分 3.5 床 公 鋪 分 1 1 1 1

下列有關相似形的敘述,何者正確?

如圖, AB 是圓 O 的一弦, OM ⊥ AB ,若 AB =24, OM =9,則此圓 O 的半徑為多 少? B M A O

已知△ABC~△DEF,且△ABC 的三邊長分別為 3、4、5,則△DEF 的三邊長不可能是 下列哪一組? 4 2

兩個相似三角形的面積比為 1:2,則對應邊的比為多少?

已知△ABC 各邊的中點分別為 D、E、F。若△ABC 的面積為 12,則△DEF 的面積為多 少?

在△ABC 中,若∠A:∠B:∠C=1:2:3,則 AB : BC : CA =?

若 abc≠0,3(b+c)=4(a+c)=6(a+b),依 bc:ca:ab 的比將 92 分成三份,則此三組值 各為多少?

下列哪一個條件無法確定兩個三角形相似?

Ben believes ___ his son can win all the games.

The music is too loud. Would you mind ___ down the radio a little?

Most of the children in the town know Ms. Collins. She ___ English in an elementary school since she 2 moved here.

After Julie broke up with Richard, she _______ all the letters from him.

I’ve made a big bowl of _______. Let’s sit down and eat it.

William has a toothache. He should go to the _______.

A:I’d like to eat the ___ fruit on the table. B:Do you mean grapes?

Grace can’t see things clearly because she is almost ___ in her left eye.

A:Don’t be ___. Come and touch my pet dog. B:No, thanks. I’m afraid of dogs.

Tom is a good ___. He never runs a red light.

Helen bought and downloaded many useful ___ on her smartphone to learn English.

A:Where does Henry come from? B:The USA. He is a(n) .

In America, children ask for ___ from door to door on Halloween.