
九上第一次段考模擬卷2
Quiz
•
Mathematics
•
9th Grade
•
Medium
黃俊賓 關山國中
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26 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
已知某三角形三內角的度數比為2:3:4,則此三角形最大內角為多少?
90°
80°
60°
50°
Answer explanation
三角形內角和為180°,設三內角為2x、3x、4x,則2x + 3x + 4x = 180°,解得x = 20°。故三內角分別為40°、60°、80°,最大內角為80°。
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
若a:b=3:2,b:c=5:4,則a:b:c=?
3:2:4
6:5:4
15:10:8
15:10:12
Answer explanation
由於a:b=3:2和b:c=5:4,我們可以將b的值統一。設b=10,則a=15,c=8。因此,a:b:c=15:10:8,正確答案是15:10:8。
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如右圖,△ABC中,DE//BC,若BD=8,AE=15,CE=10,則AD=?
9
10
12
20
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
已知四邊形ABCD是四邊形PQRS的4倍縮放圖,若∠P:∠Q:∠R:∠S=6:2:3:4,則∠P的對應角∠A的度數為何?
144°
96°
72°
48°
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列敘述何者正確? (A)作兩菱形必相似 (B)作兩矩形必相似 (C)作兩直角三角形必相似 (D)作兩正三角形必相似。
作兩菱形必相似
作兩矩形必相似
作兩直角三角形必相似
作兩正三角形必相似
Answer explanation
作兩正三角形必相似,因為正三角形的內角均為60度,無論大小,形狀相同。其他選項不一定相似,例如兩菱形可有不同的角度。
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如右圖,將平行四邊形ABCD分割成六個小平行四邊形,已知AE:EB=7:2,AG:GH:HD=2:3:4,則甲、乙、丙、戊中,哪一個圖形與平行四邊形ABCD相似?
戊
丁
丙
甲
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