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九上數學1-4

Authored by 蔡佩旻 蔡佩旻

Mathematics

9th Grade

Used 9+ times

九上數學1-4
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8 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

如右圖,△ABC是一個直角三角形公園,其中∠A=90°,AB=40公尺、AC=30公尺。小妍發現遛狗區    △EBD也是一個直角三角形,∠BED=90°,而且測量出D點剛好是的中點,請幫小妍計算出△EBD面積與△ABC面積關係,△EBD面積:△ABC面積=?

1:4

1:16

2:5

4:25

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

如右圖,△ABC為邊長12的正三角形,且DEF分別為△ABC各邊中點,GHI分別為△DEF各邊中點,則下列哪個錯誤?

所有線段長的和63

ABC面積=36根號3

DEF面積=9根號3

DEF周長為8

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

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一部雲梯消防車之部分長度如右圖所示,其中雲梯(AB)長為30公尺,當雲梯與水平面成35°時,A點離地面的高度為多少公尺?(sin35°≒0.573576436,以四捨五入法求到小數點後第1位)

3.4

17.2

20.6

33.4

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

如右圖,△ABC中,∠B135°,∠C30°,AB=4,求△ABC的面積為多少?

2根號6

4根號3

4根號3-4

8根號3-8

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

直角△ABC中,∠A90°,AB=12,BC=20,AC=16。作的中垂線L,分別交、於DE兩點,求CD=?

25

20

12.5

10

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

如右圖,已知小妍的身高為160公分,在太陽下,當他的影子長為100公分時,量出旗杆的影子長為250公分,求旗杆長為多少公分?

200

300

400

500

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

直角△ABC中,已知∠B=90°,∠A=30°,若△ABC的面積為8根號3,則△ABC的周長為何?

124根號3

12

24+4根號3

24根號3

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