問題詳情
5. △ABC中,已知 , 下列敍述何者正確?
(A) sinA: sinB: sinC = 5:7:8
(B)∠C度數大於 90°
(C)∠A= 60°
(D)△ABC面積=10 。
參考答案
答案:C
難度:適中0.6
書單:沒有書單,新增
內容推薦
- 一多重選擇題有A、B、C、D 四個選項(至少有一個選項是對的),試問作答的填寫方式共有多少種?(A) 4 (B) 5 (C) 15 (D) 16 。
- 求 之值為何?(A) 1 (B) 2 (C) 3 (D) 4 。
- 一次函數y=-2 x+6與x軸、y軸分別交於A、B二點,在函數圖形上過第四象限取一點C,作 垂直x軸且交x軸於D點。已知△ABO面積:△ACD 面積=9:4。請問C點的y座標為何?(A) -4
- 如圖(九),邊長8的正方形ABCD 內,有一個小長方形EFGH,其中E為正方形兩對角線的交點,F、G分別在 上,且 =3:1 ,試求四邊形BFGH的面積為何? (A) (B) (
- 如圖(八),邊長為20的正△ABC中,E、F 二點分別在 上, 若∠AEF=60°,=8,則 =? (A) (B) (C) (D)
- 如圖(七),△ABC中, 交於F, =2:3 , =1:2 ,求 =? (A) 4: (B) 4: (C) 3: (D) 5:4
- 如圖(六),ABCD為平行四邊形,下列有關相似三角形的敘述何者錯誤? (A) △AEF~△AEB (B) △BAF~△G CB (C) △ECG~△EAB (D) △ACD~△CAB
- 如圖(五),梯形ABCD中, ,已知 ,求 =? (A) 2: (B) 3: (C) 4: (D) 3:7
- 如下圖,直角△ABC中,∠B=90°, ,已知 =? (A) (B) (C) (D)
- 如圖(四),菱形ABCD中, 。若 P、Q、R、S 分別為 的中點,試求四邊形PQRS的面積=? (A) (B) (C) (D) 108
內容推薦
- 已知 ,請問下列選項何者正確? (A) L1 與 L2 重合 (B) L1 與 L2 平行 (C) L1 與 L2 歪斜 (D) L1 與 L2 交於一點。
- 請問下列選項何者為有理數?(A) π (B) (C) (D)
- 已知 ,請問下列選項何者正確?(A) (B) (C) det(A ) = 10 (D) det(2B) = 2 det( B)
- Here _____.(A) Ms. Chen comes (B) are they(C) have two comic books on the desk(D) is a gift for yo
- Jerry: Mom, the washing machine doesn’t work. Mom: I’ll have someone _____it, but now you have ___
- Student:_____ enough water on the earth in the year 2020? Teacher: I don’t think so. We should sav
- Many elderly people are choosing _____ alone instead of _____ with their children.(A) to live; liv
- A: _____was it in Taiwan last year?B: It was really terrible. _____at least five typhoons all the
- Most of my friends have a cellphone of their own, but Mom won’t buy me one. She says I can have my
- Mom didn’t let me _____online games because I didn’t practice_____ the guitar.(A) to play; play(B)
- _____ in Japan in winter?(A) Do they have lots of snows(B) Are there a lot of snow(C) Does it snow
- Which is right?(A) We’re going to study in the library, but my sister won’t.(B) My dad is flying
- Which is right?(A) A: Why not going camping in the mountains? B: That’s a good idea.(B) A: How in
- Which is NOT right?(A) The Lin family had a good time to visit the farm.(B) Like all the girl
- 已知變數 x 與 y 的資料散布圖如下,且變數 x 與 y 的相關係數為 r ,請問下列選項何者正確? (A) r < -1 (B) -1 < r < 0 (C) 0 <
- 【題組】(A) had(B) were(C) will have(D) will be
- 【題組】(A) gives(B) gave(C) is giving(D) will give
- 【題組】(A) is(B) was(C) will be(D) be
- 已知 A(3,4,5) ,請問下列選項何者正確?(A) A 點到 x 軸的距離為 (B) A 點到 xy 平面的距離為 7 (C) A 點到原點的距離為 5(D) A 點對 yz 平面的對稱
- 請問下列選項何者為發散數列?(A) (B) (C) (D)
- 【題組】Which is right?(A) is YoYo Breakfast.(B) is MoMo Restaurant(C) is a bus stop (D) is Tim’s
- 【題組】Which is right?(A) We can see “ people pushers” in New York.(B) The merto system in Taiwan is
- Ellen is planning ______ a running race this summer.(A)join (B) joins (C) joining (D) to join
- Washing clothes and cleaning the house ______ tiring(令人疲累的) to me.(A) are (B) is (C) do (D) did
- Brain: What _______ you doing then?Randy: I _________.(A)was ; cooking (B) were ; was cooking (C