正多邊形
Quiz
•
Mathematics
•
8th Grade
•
Practice Problem
•
Hard
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
一个圆的内接正多边形中，一条边所对的圆心角为18°，则该正多边形的边数是（ ）
A. 14
B. 18
C. 16
D. 20
A
B
C
D
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如图，已知正五边形ABCDE内接于⊙O，则∠AOB的度数是（ ）
A. 45°
B. 60°
C. 72°
D. 90°
A
B
C
D
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如图，正五边形ABCDE内接于⊙O，点P是劣弧BC上一点（点P不与点C重合），则∠CPD=（ ）
A. 45°
B. 36°
C. 35°
D. 30°
A
B
C
D
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
如图，正方形ABCD内接于⊙O，点P在弧AB上，则∠BPC的度数为（ ）
A．30°
B．45°
C．60°
D．90°
A
B
C
D
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
⊙O是一个正n边形的外接圆，若⊙O的半径与这个正n边形的边长相等，则n的值为（ ）
A．3
B．4
C．5
D．6
A
B
C
D
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
若一个圆内接正多边形的中心角是36°，则这个多边形是（ ）
A．正五边形
B．正八边形
C．正十边形
D．正十八边形
A
B
C
D
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
正六边形的周长为6，则它的外接圆半径为（ ）
A．1
B．2
C．3
D．6
A
B
C
D
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