3上 3-2 三角形的外心、內心與重心
Quiz
•
Mathematics
•
9th Grade
•
Practice Problem
•
Medium
康軒數位 康軒數位
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
已知O點為△ABC的外心,若∠AOC=140°,則∠B=?
70°
110°
70°或110°
40°或110°
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
3:4:5
5:6:4
12:10:15
1:1:1
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
已知△ABC中,I點為此三角形的內心,若∠BIC=135°,則△ABC是下列哪一種三角形?
銳角三角形
直角三角形
鈍角三角形
條件不足,無法確定
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
坐標平面上,直線3x-4y+12=0與x軸交於A點,與y軸交於B點,設O為原點,則△AOB的內切圓半徑為多少?
1
2
3
4
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
三中線的交點上
三高的交點上
三邊垂直平分線的交點上
三內角平分線的交點上
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
∠OBC=40°
∠AOC=130°
∠OAB=30°
∠ACB=65°
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
32
48
57
63
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