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已知一个等腰三角形两内角的度数之比为1:4,则这个等腰三角形顶角的度数为( ) ...
已知一个等腰三角形两内角的度数之比为1:4,则这个等腰三角形顶角的度数为( )
A.20°或100°
B.120°
C.20°或120°
D.36°
考点分析:
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C.
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C.
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D.
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