挑战习题
1
/5
单选题
难度:
1.如图,∠BDC=98°,∠C=38°,∠B=23°,∠A的度数是( )
A
61°
B
60°
C
37°
D
39°
提示1:
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正确答案:
Qw==
6Kej77ya5qC55o2u6aOe6ZWW5b2i77yM4oigQkRDPeKIoEIr4oigQyviiKBBPGJyPuaJgOS7peKIoEE9IDk4wrAtMzjCsC0yM8KwPTM3wrA=
2
/5
单选题
难度:
2.如图,已知△ABC,O是△ABC内的一点,连接OB、OC,将∠ABO、∠ACO分别记为∠1、∠2,则∠1、∠2、∠A、∠O四个角之间的数量关系是( )
A
∠1+∠0=∠A+∠2
B
∠1+∠2+∠A+∠O=180°
C
∠1+∠2+∠A+∠O=360°
D
∠1+∠2+∠A=∠O
提示1:
IOagueaNruinhumikeS4remjnumVluW9ouaooeWei+eahOiusuino++8jOW/q+mAn+W+l+WIsOetlOahiA==
正确答案:
RA==
6Kej77ya5qC55o2u6KeG6aKR5Lit6aOe6ZWW5b2i5qih5Z6L55qE6K6y6Kej77yM5Y+v5b6X4oigMSviiKAyK+KIoEE94oigTw==
3
/5
单选题
难度:
3.如图1,线段AB、CD相交于点O,连接AD、CB,我们把形如图1的图形称之为“8字形”. 如图2,在图1的条件下,∠DAB和∠BCD的平分线AP和CP相交于点P,并且与CD、AB分别相交于M、N. 其中正确结论是( )
(1)在图1中∠A+∠D=∠C+∠B.
(2)在图2中“8字形”的个数为4.
(3)图2中,当∠D=50度,∠B=40度时∠P=45度.
(4)图2中∠D和∠B为任意角时其他条件不变∠D+∠B=2∠P.
A
(1)(2)(3)
B
(1)(2)(3)
C
(1)(3)(4)
D
(1)(2)(3)(4)
提示1:
IOagueaNruinhumikeS4reaooeWei+eahOiusuino++8jOmAkOS4quWIhuaekA==
正确答案:
Qw==
6Kej77ya77yIMe+8ieagueaNruS4ieinkuW9ouWGheinkuWSjOWumueQhuWNs+WPr+W+l+WHuuKIoEEr4oigRD3iiKBDK+KIoELvvJs8YnI+77yIMu+8ieagueaNruKAnDjlrZflvaLigJ3nmoTlrprkuYnvvIzku5Tnu4bop4Llr5/lm77lvaLljbPlj6/lvpflh7rigJw45a2X5b2i4oCd5YWx5pyJNuS4qu+8mzxicj7vvIg077yJ55Sx4oigRCviiKAxK+KIoDI94oigQiviiKAzK+KIoDTikaA8YnI+55Sx4oigT05DPeKIoEIr4oigND3iiKBQK+KIoDLvvIzikaE8YnI+4pGgK+KRoeW+l++8mjxicj7iiKBEKzLiiKBCKzLiiKAxKzLiiKAzPeKIoEIrMuKIoDMrMuKIoFArMuKIoDHvvIw8YnI+4oigRCsy4oigQj0y4oigUCviiKBC77yMPGJyPuWNszLiiKBQPeKIoEQr4oigQjxicj7vvIgz77yJ5qC55o2u77yINO+8ieaOqOWvvOWHuue7k+iuuuWPr+W+lzLiiKBQPeKIoEQr4oigQu+8jOKIoFA9NDXCsA==
4
/5
单选题
难度:
4.如图,已知∠BGF=150°,那么∠A+∠B+∠C+∠D+∠E+∠F的度数是( )
A
150°
B
300°
C
450°
D
600°
提示1:
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正确答案:
Qg==
6Kej77ya5o+Q5Y+W6aOe6ZWW5b2i77yM4oigQ0dFPeKIoEMr4oigRSviiKBB77ybPGJyPuKIoEJHRj3iiKBEK+KIoEIr4oigRjxicj7lj4jiiKBDR0U94oigQkdGPTE1MMKwPGJyPuKItOKIoEEr4oigQiviiKBDK+KIoEQr4oigRSviiKBGPTMwMMKw
5
/5
单选题
难度:
5.如图,已知∠CGE=120°,则∠A+∠B+∠C+∠D+∠E+∠F=( )
A
150°
B
210°
C
240°
D
270°
提示1:
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正确答案:
Qw==
6Kej77ya55Sx6aOe6ZWW5b2i5Y+v55+l77yM4oigQkdGPeKIoEEr4oigQiviiKBG77ybPGJyPuKIoENHRT3iiKBEK+KIoEUr4oigQzxicj7lm6DkuLriiKBDR0U94oigQkdGPTEyMMKwPGJyPuaJgOS7peKIoEEr4oigQiviiKBDK+KIoEQr4oigRSviiKBGPTI0MMKw