如何用一把没有刻度的直尺和一个圆规在一张白纸上画出一个正17边形? 怎样用一把无刻度的直尺和一个圆规画一个正17边形
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与圆O直径AB垂直半径OC上作出OC点DOB上作点E使OE等于半径1/8;E圆心ED长半径作弧与OA、OB分别交于F、G;F圆心FD长半径作弧交OA延长线于HG圆心GD长半径作弧交OA于I;作OB点J线段IJ直径作圆交OC于K;过K作AB平行线与线段OH直径圆交于远端L过L作OC平行线与圆O交于M弧AM圆O1/17依次连结各点行了
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绛旓細. 鏈変竴涓浠绘剰瑙扐BC 2. 鍙﹀锛屽湪鐩村昂涓婁换鎰忔埅鍙栦竴璺濈OP 3. 浠涓哄渾蹇冦丱P涓哄崐寰勶紝鐢讳竴鍦嗭紝璇ュ渾涓嶣C鐩镐氦浜嶺銆4. 灏嗙洿灏烘斁鍦ㄥ渾涓婏紝鐢盭鐐逛綔涓鐩寸嚎锛屼娇璇ョ洿绾夸笌鍦嗗懆鐩镐氦涓嶱涓斾笌AB寤剁嚎鐩镐氦浜嶰锛屾墍浠B = OP銆5. 璁锯垹POB = a锛屽洜涓 PO = PB锛屾墍浠モ垹PBO = a銆傜敱姝わ紝鈭燲PB = 2a銆傚洜涓...
