R是半径还是直径? r是直径还是半径？

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r\u662f\u534a\u5f84\u3002
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在圆的公式表达中R代表半径，D代表直径

r是圆的半径

“R”是半径，不是直径。

r琛ㄧず鍗婂緞杩樻槸鐩村緞
绛旓細鍗婂緞銆傚崐寰勭殑鑻辨枃鏄痳adius锛屽湪鏁板鍑犱綍鏈涓紝鐢ㄥ瓧姣R浠ｈ〃鍗婂緞銆傚湪鍦嗕腑锛岃繛鎺ュ渾蹇冨拰鍦嗕笂浠绘剰涓鐐圭殑绾挎鍙仛鍦嗙殑鍗婂緞銆

R鍜孌鍝釜鏄鐩村緞鍝釜鏄崐寰
绛旓細R鏄崐寰锛孌鏄鐩村緞銆傚崐寰勬槸鏁板鍑犱綍涓殑鏈锛屾寚杩炴帴鍦嗗績鍜屽渾涓婁换鎰忎竴鐐圭殑绾挎鍦嗕笂鏈闀跨殑涓ょ偣闂磋窛绂荤殑涓鍗婏紝閫氬父鐢ㄥ瓧姣峳琛ㄧず銆傜洿寰勬槸鎸囬氳繃涓骞抽潰鍥惧舰鎴栫珛浣撳鍦嗐佸渾閿ユ埅闈佺悆銆佺珛鏂逛綋涓績鍒拌竟涓婁袱鐐归棿鐨勮窛绂伙紝閫氬父鐢ㄥ瓧姣峝琛ㄧず銆

r鏄崐寰勮繕鏄洿寰 r鏄崐寰勫悧
绛旓細1銆鍗婂緞鐨勮嫳鏂囨槸radius锛屽湪鏁板鍑犱綍鏈涓紝鐢ㄥ瓧姣R浠ｈ〃鍗婂緞銆2銆佸崐寰勶細鍦ㄥ渾涓紝杩炴帴鍦嗗績鍜屽渾涓婁换鎰忎竴鐐圭殑绾挎鍙仛鍦嗙殑鍗婂緞銆傞氬父鐢ㄥ瓧姣峈鏉ヨ〃绀恒傚湪鐞冧腑锛岃繛鎺ョ悆蹇冨拰鐞冮潰涓婁换鎰忎竴鐐圭殑绾挎鍙仛鐞冪殑鍗婂緞銆傛澶氳竟褰㈡墍鍦ㄧ殑澶栨帴鍦嗙殑鍗婂緞鍙仛鍦嗗唴鎺ユ澶氳竟褰㈢殑鍗婂緞銆

澶у啓r鏄崐寰勮繕鏄洿寰
绛旓細鍗婂緞銆傚ぇ鍐欏瓧姣R閫氬父琛ㄧず鍦嗙殑鍗婂緞锛岃繖鏄洜涓篟涓巖adius锛堣嫳鏂囬噷鐨勨滃崐寰勨濓級鐨勯瀛楁瘝鐩稿悓锛屽湪鏁板鍜岀墿鐞嗗涓紝R鐢ㄦ潵琛ㄧず鍦嗐佺悆銆佸渾鐜瓑鍑犱綍褰綋鐨勫崐寰勶紝鑰屼笉鏄〃绀鐩村緞鎴栧叾瀹冮噺銆

鍦嗙殑鏂圭▼涓r鎸囩殑鏄崐寰勮繕鏄洿寰
绛旓細r鏄崐寰锛孌鏄鐩村緞

鍦ㄥ渾褰腑鈥R鈥濇槸鐩村緞杩樻槸鍗婂緞
绛旓細R鎸鍗婂緞锛2R涓虹洿寰

r鎸囩殑鏄鐩村緞杩樻槸鍗婂緞
绛旓細濡傛灉娌℃湁鐗规畩璇存槑锛屽垯瀛楁瘝r浠ｈ〃鍦嗙殑鍗婂緞锛屽瓧姣峝浠ｈ〃鍦嗙殑鐩村緞锛屽瓧姣峴浠ｈ〃鍦嗙殑闈㈢Н锛屽瓧姣峜浠ｈ〃鍦嗙殑鍛ㄩ暱锛屽畠浠殑鍏崇郴濡備笅锛歞=2r锛泂=蟺r²锛沜=2蟺r=蟺d.

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