2025年教学资料:4. 2弧度制(分层作业)(解析版)
4.2弧度制分层作业1.-300°化为弧度是( B )A.- B.-C.-D.-2.( )A.B.C.D.【答案】B【分析】利用弧度与角度的关系即可求解.【详解】,故选:B.3.在半径为9的圆中,的圆心角所对弧长为( )A.900B.C.D.【答案】B【分析】根据角度制与弧度制转化并结合弧长公式即可得到答案.【详解】,则所对弧长为.故选:B4.已知一扇形的圆心角为,半径为9,则该扇形的面积为( )A.B.C.D.【答案】A【分析】先把角度转化为弧度,根据弧度制下扇形的面积公式即可求解.基础巩固【详解】因为,所以该扇形的面积为.故选:A5.已知扇形的周长为8cm,...
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