推理證明與三角形三心
Quiz
•
Mathematics
•
9th Grade
•
Practice Problem
•
Medium
洪榮忠 新湖國中
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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
那一個不是判別兩條線是否為「平行線」的性質?
同側內角相等
同側內角互補
內錯角相等
同位角相等
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
下列那一個性質不能保證兩個三角形全等?
ASA
SSA
RHS
SSS
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
已知:a3為一個偶數,3b為一個奇數。
求證:a2+b2為奇數。
證明:(1)∵a3為一個偶數,∴a為偶數
(2)∵3b為一個奇數,∴b為奇數
(3)設a=2m(m是整數),b=2n+1(n是整數)則a2+b2= (甲)
(4)其中(甲)不為2的倍數,∴a2+b2為奇數。
請問(甲)應填入下列何者,可得完整證明?
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
三角形兩邊中垂線之交點稱為_____心。
重心
垂心
內心
外心
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
若 A、B、C 三個鄉鎮不在同一直線上,要設立一個購物中心 O,使之到三個鄉鎮等距離,則 O 為△ABC 的什麼心?
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
已知直角三角形的三邊長為6、a、b(a、b為正整數),且b為斜邊,則(a+b)必為下列哪一個數的因數?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
三角形三中線交於一點,我們稱此點為?
中心
重心
內心
外心
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