
相似三角形應用測驗
Authored by 老師 誠誠
Mathematics
9th Grade
20 Questions

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1.
OPEN ENDED QUESTION
3 mins • 1 pt
在△ABC中,若∠C為直角,∠A為其中一個銳角,則:a/c=sinA,b/c=cosA,a/b=tanA。
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2.
OPEN ENDED QUESTION
3 mins • 1 pt
不論直角三角形的大小,(1)若三內角為45°、45°、90°,則其對應邊長比為1:1:2。(2)若三內角為30°、60°、90°,則其對應邊長比為1:3:2。
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3.
OPEN ENDED QUESTION
3 mins • 1 pt
在△ABC與△DEF中,∠A=∠D,AB:DE=BC:EF,則△ABC與△DEF是否一定相似?試說明理由。
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4.
OPEN ENDED QUESTION
3 mins • 1 pt
DE // BC 這個敘述是否正確?
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5.
OPEN ENDED QUESTION
3 mins • 1 pt
在△ABC與△DEF中,∠A=∠D,AB:DE=BC:EF,則△ABC與△DEF是否一定相似?試說明理由。
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6.
OPEN ENDED QUESTION
3 mins • 1 pt
兩個三角形之間有兩相對應邊成比例,又有一組對應角相等,則這兩個三角形必相似。這個敘述正確嗎?
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7.
OPEN ENDED QUESTION
3 mins • 1 pt
已知A、C、E三點在同一直線上,B、C、D三點在同一直線上,且AB、DE分別與BD垂直。若AB=10、DE=4、BD=21,則BC=?
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