r指的是直径还是半径 R是半径还是直径?
R\u6307\u7684\u662f\u534a\u5f84\u8fd8\u662f\u76f4\u5f84\uff1f\u534a\u5f84\u7684\u82f1\u6587\u662fradius\uff0c\u5728\u6570\u5b66\u51e0\u4f55\u672f\u8bed\u4e2d\uff0c\u7528\u5b57\u6bcdR\u4ee3\u8868\u534a\u5f84\u3002
\u76f4\u5f84\u7684\u82f1\u6587\u662fdiameter\uff0c\u5728\u6570\u5b66\u51e0\u4f55\u672f\u8bed\u4e2d\uff0c\u7528\u5b57\u6bcdD\u4ee3\u8868\u76f4\u5f84\u3002
\u62d3\u5c55\u8d44\u6599\uff1a\u534a\u5f84\u4e0e\u76f4\u5f84
\u4e00\u3001\u534a\u5f84\uff1a
1\u3001\u5728\u5706\u4e2d\uff0c\u8fde\u63a5\u5706\u5fc3\u548c\u5706\u4e0a\u4efb\u610f\u4e00\u70b9\u7684\u7ebf\u6bb5\u53eb\u505a\u5706\u7684\u534a\u5f84\u3002\u901a\u5e38\u7528\u5b57\u6bcdR\u6765\u8868\u793a\u3002
2\u3001\u5728\u7403\u4e2d\uff0c\u8fde\u63a5\u7403\u5fc3\u548c\u7403\u9762\u4e0a\u4efb\u610f\u4e00\u70b9\u7684\u7ebf\u6bb5\u53eb\u505a\u7403\u7684\u534a\u5f84\u3002
3\u3001\u6b63\u591a\u8fb9\u5f62\u6240\u5728\u7684\u5916\u63a5\u5706\u7684\u534a\u5f84\u53eb\u505a\u5706\u5185\u63a5\u6b63\u591a\u8fb9\u5f62\u7684\u534a\u5f84\u3002
\u534a\u5f84\u7684\u6027\u8d28\uff1a
1\u3001\u5728\u540c\u4e00\u4e2a\u5706\u5185\uff0c\u6240\u6709\u7684\u534a\u5f84\u90fd\u76f8\u7b49\u3002
2\u3001\u5706\u7684\u4e00\u6761\u5207\u7ebf\u548c\u4e0e\u4e4b\u76f8\u4ea4\u7684\u534a\u5f84\u5782\u76f4\u3002
3\u3001\u540c\u5706\u6216\u7b49\u5706\u7684\u534a\u5f84\u662f\u76f4\u5f84\u7684\u4e00\u534a\uff1b\u76f4\u5f84\u662f\u534a\u5f84\u76842\u500d\u3002
4\u3001\u534a\u5f84\u76f8\u7b49\u7684\u4e24\u4e2a\u5706\u7684\u9762\u79ef\u76f8\u7b49\u3002
\u4e8c\u3001\u76f4\u5f84
1\u3001\u76f4\u5f84\u662f\u901a\u8fc7\u5706\u5fc3\u4e14\u4e24\u4e2a\u7aef\u70b9\u90fd\u5728\u5706\u4e0a\u4efb\u610f\u4e00\u70b9\u7684\u7ebf\u6bb5.\u4e00\u822c\u7528\u5b57\u6bcdD\u8868\u793a.
2\u3001\u76f4\u5f84\u6240\u5728\u7684\u76f4\u7ebf\u662f\u5706\u7684\u5bf9\u79f0\u8f74\u3002
3\u3001\u76f4\u5f84\u7684\u4e24\u4e2a\u7aef\u70b9\u5728\u5706\u4e0a\uff0c\u5706\u5fc3\u662f\u76f4\u5f84\u7684\u4e2d\u70b9\u3002\u76f4\u5f84\u5c06\u5706\u5206\u4e3a\u9762\u79ef\u76f8\u7b49\u7684\u4e24\u90e8\u5206,\u4e2d\u95f4\u7684\u7ebf\u6bb5\u5c31\u53eb\u76f4\u5f84(\u6bcf\u4e00\u4e2a\u90e8\u5206\u6210\u4e3a\u4e00\u4e2a\u534a\u5706)\u3002
\u76f4\u5f84\u7684\u6027\u8d28\uff1a
1\u3001\u5728\u540c\u4e00\u4e2a\u5706\u4e2d\u76f4\u5f84\u7684\u957f\u5ea6\u662f\u534a\u5f84\u76842\u500d\uff0c\u53ef\u4ee5\u8868\u793ad=2r\u6216r=d/2
2\u3001\u5728\u540c\u4e00\u4e2a\u5706\u4e2d\u76f4\u5f84\u662f\u6700\u957f\u7684\u5f26\u3002
d=2r；s=πr²；c=2πr=πd.
半径，d是直径。
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