初三几何题`快帮忙
园的一条玄`其长度等于这个圆的半径 则这个玄所对的圆周角为多少度??????????``````````````````````````````````````````````````````````````````````````````````天才帮我解答 具体步骤也写出来
30度啊 把一条玄的2端与圆心 连接起来 那不就是等边3角行吗 圆心角60度
答:过A作三角形的高交BC于F,则BF=ABcosB=3,BC=2BF=6 角C小于90度,由于条件不足,无法求得BD详情>>
答:详情>>