摘要：4．Which sport does Tom like best?
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30、多选题：
A quadrilateral that can be inscribed in a circle is also called a cyclic quadrilateral．Which of these quadrilaterals are always cyclic
A．parallelograms kites B．isosceles trapezoids C．rhombuses
D．rectangles E．squares．
圆内接四边形又称为联圆四边形，下列是联圆四边形的有
A．平行四边形；B．等腰梯形；C．菱形；D．矩形；E．正方形．
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A quadrilateral that can be inscribed in a circle is also called a cyclic quadrilateral．Which of these quadrilaterals are always cyclic
BDE
．A．parallelograms kites B．isosceles trapezoids C．rhombuses
D．rectangles E．squares．
圆内接四边形又称为联圆四边形，下列是联圆四边形的有
BDE
A．平行四边形；B．等腰梯形；C．菱形；D．矩形；E．正方形．
10、Wangbei’computer shows the dates on the screen，Which of these dates are symmetrical（轴对称）？（ ）
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Given a，b，c satisfy c＜b＜a and ac＜0，then which one is not sure to be correct in the following inequalities？（ ）
（英汉词典：besureto确定；correct正确的；inequality不等式）
（英汉词典：besureto确定；correct正确的；inequality不等式）
A、
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B、
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C、
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D、
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As in figure 2．In the circular ring of which center is point O．if AO⊥BO，and the area of the shadowy part is 25cm2，then the area of the circuiar ring equals to（ ） （π≈3.14）