如图是4×4的正方形网格，点C在∠BAD的一边AD上，且A、B、C为格点，sin∠BAD的值是
\u5982\u56fe\u662f4\u00d74\u7684\u6b63\u65b9\u5f62\u7f51\u683c\uff0c\u70b9C\u5728\u2220BAD\u7684\u4e00\u8fb9AD\u4e0a\uff0c\u4e14A\u3001B\u3001C\u4e3a\u683c\u70b9\uff0csin\u2220BAD\u7684\u503c\u662f______\u8fde\u63a5BC\uff0c\u6839\u636e\u52fe\u80a1\u5b9a\u7406\uff0c\u53ef\u6c42\u5f97AB= 5 \uff0cBC= 5 \uff0cAC= 10 \uff0c\u6839\u636e\u52fe\u80a1\u5b9a\u7406\u7684\u9006\u5b9a\u7406\uff0c\u53ef\u5f97\u2220ABC=90\u00b0\uff0c\u2234sin\u2220BAD= BC AC = 5 10 = 2 2 \uff0e\u6545\u7b54\u6848\u4e3a\uff1a 2 2 \uff0e
\u89e3\uff1a\u8fde\u63a5BC\uff0c\u6839\u636e\u52fe\u80a1\u5b9a\u7406\uff0c\u53ef\u6c42\u5f97AB=5\uff0cBC=5\uff0cAC=10\uff0c\u6839\u636e\u52fe\u80a1\u5b9a\u7406\u7684\u9006\u5b9a\u7406\uff0c\u53ef\u5f97\u2220ABC=90\u00b0\uff0c\u2234sin\u2220BAD=BCAC=510=22\uff0e\u6545\u7b54\u6848\u4e3a\uff1a22\uff0e
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