如图，在△ABC中，∠BAC=90°，BC=5cm，AC=3cm，将△ABC绕顶点C按顺时针方向旋转45°至△A1B1C的位置，则线段AB扫过区域（图中阴影部分）的面积为_1 cm2．_刷题宝

题干

如图，在△ABC中，∠BAC=90°，BC=5cm，AC=3cm，将△ABC绕顶点C按顺时针方向旋转45°至△A₁B₁C的位置，则线段AB扫过区域（图中阴影部分）的面积为____ cm²．

上一题下一题 0.0难度选择题更新时间:2019-02-05 01:09:15

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2π

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