(2009·益阳)如图,将以A为直角顶点的等腰直角三角形ABC沿直线BC平移得到△A′B′C′,使点B′与C重合,连接A′B,则tan∠A′BC′的值为| 1 |
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(2009·孝感)如图,角α的顶点为O,它的一边在x轴的正半轴上,另一边OA上有一点P(3,4),则sinα=| 4 |
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(2009·西宁)在正方形网格中,△ABC的位置如图所示,则cos∠B的值为
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(2009·庆阳)如图,菱形ABCD的边长为10cm,DE⊥AB,sinA=| 3 |
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