半圆的周长的公式是什么,半圆的面积又是什么。
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半圆周长=πr+2r (r为圆的半径)半圆面积=πr²/2
直径×π÷2+直径=周长
半径的平方×π÷2=面积
绛旓細鍗婂渾鍛ㄩ暱=蟺r+2r 锛坮涓哄渾鐨勫崐寰勶級鍗婂渾闈㈢Н=蟺r²/2
绛旓細鍗婂渾鐨勫懆闀=蟺r+d鎴栵細鍗婂渾鐨勫懆闀=蟺r+2r锛涘渾鐨勫崐寰勬槸r锛岄偅涔堣繖涓渾鐨勫懆闀垮氨鏄細蟺d=2蟺r锛屽崐鍦嗘槸鍦嗗懆闀跨殑涓鍗婂姞鐩村緞锛屽懆闀挎槸2蟺r/2+d=蟺r+2r锛屽鏋滃凡鐭ョ洿寰刣锛岄偅涔堝崐鍦嗙殑鍛ㄩ暱鍒欐槸蟺d/2+d銆備竴.闈㈢Н鍏紡锛1.鍦嗙殑闈㈢Н锛歋=蟺r2=蟺d2/4 2.鎵囧舰寮ч暱锛歀=鍦嗗績瑙掞紙寮у害鍒讹級*r=n掳蟺r...
绛旓細鍗婂渾鐨勫懆闀垮叕寮忔槸锛欳=1/2蟺d+d=蟺r+2r 鎺ㄥ鍏紡锛氬崐鍦嗙殑鍛ㄩ暱璁$畻鍏紡鏄r+2r锛屽渾鐨勫懆闀=2脳鍗婂緞脳鍦嗗懆鐜=鐩村緞脳鍦嗗懆鐜囧渾鐨勫懆闀=2蟺r锛屽洜姝わ紝鍗婂渾鐨勫懆闀垮氨绛変簬蟺r+2r銆傚崐鍦嗙殑鍛ㄩ暱鏄渾鍛ㄩ暱鐨勪竴鍗婃寚鐨勬槸鍥存垚鏁翠釜鍦嗗姬闀跨殑浜屽垎涔嬩竴锛屽畠鎸囩殑鏄姬闀匡紱鑰屸滃崐鍦嗙殑鍛ㄩ暱鈥濇寚鐨勬槸鍥存垚鍗婅竟鍦嗚繖涓浘褰...
绛旓細鍗婂渾鐨勫懆闀挎槸:鐜粫鍗婂渾杈圭紭涓鍛ㄧ殑闀垮害銆鍗筹細鍗婂渾鐨勫懆闀=蟺r+d锛涙垨锛氬崐鍦嗙殑鍛ㄩ暱=蟺r+2r銆傚渾鍛ㄧ巼鐢ㄥ笇鑵婂瓧姣嵪锛堣浣滐蓟pa?锛斤級琛ㄧず锛屾槸涓涓父鏁帮紙绾︾瓑浜3.141592654锛夛紝鏄唬琛ㄥ渾鍛ㄩ暱鍜岀洿寰勭殑姣斿笺傚畠鏄竴涓棤鐞嗘暟锛屽嵆鏃犻檺涓嶅惊鐜皬鏁般
绛旓細鍗婂渾鐨勫懆闀垮叕寮忥細C=蟺r+2r銆傚叕寮忔弿杩帮細鍏紡涓璻涓哄崐鍦嗙殑鍗婂緞銆傚渾鐨勫懆闀縞=蟺d銆傚渾鍛ㄩ暱鐨勪竴鍗奵=蟺r銆傚崐鍦嗙殑鍛ㄩ暱c=蟺r+2r銆傚崐鍦嗙殑鍛ㄩ暱濡備綍璁$畻鍗婂渾鐨勫懆闀匡紳鍗婂渾鐨勫懆闀匡細1/2鍦嗙殑鍛ㄩ暱+鐩村緞=鐩村緞脳蟺梅2+鐩村緞銆傚叕寮忥細L锛澫d梅2+d锛2蟺r梅2+d=鍗=蟺r+d=蟺r+2r銆
绛旓細C=蟺r+2r鎺ㄥ鍏紡锛鍗婂渾鐨勫懆闀胯绠楀叕寮忔槸蟺r+2r锛屽渾鐨勫懆闀匡紳2脳鍗婂緞脳鍦嗗懆鐜囷紳鐩村緞脳鍦嗗懆鐜 鍦嗙殑鍛ㄩ暱锛2蟺r锛屽洜姝わ紝鍗婂渾鐨勫懆闀垮氨绛変簬蟺r+2r銆傚崐鍦嗙殑鍛ㄩ暱鏄渾鍛ㄩ暱鐨勪竴鍗婃寚鐨勬槸鍥存垚鏁翠釜鍦嗗姬闀跨殑浜屽垎涔嬩竴锛屽畠鎸囩殑鏄姬闀匡紱鑰屸滃崐鍦嗙殑鍛ㄩ暱鈥濇寚鐨勬槸鍥存垚鍗婅竟鍦嗚繖涓浘褰㈡墍鐢ㄧ嚎鏉$殑闀垮害锛屽畠鍖呮嫭浜嗗渾...
绛旓細鍗婂渾鐨勫懆闀垮叕寮忎负锛C=蟺r+2r锛埾涓哄渾鍛ㄧ巼锛宺涓哄渾鐨勫崐寰勶級锛涘渾鐨勫懆闀垮叕寮忎负锛欳=2蟺r=蟺d銆1銆佸渾闈㈢Н锛歋=蟺r锛孲=蟺(d/2)锛坉涓虹洿寰勶紝r涓哄崐寰勶級銆2銆佸崐鍦嗙殑闈㈢Н锛歋鍗婂渾=(蟺r^2)/2銆3銆佸渾鐨勫懆闀匡細C=2蟺r鎴朿=蟺d銆4銆佸崐鍦嗙殑鍛ㄩ暱锛歞+(蟺d)/2鎴栬卍+蟺r銆5銆佹墖褰㈡墍鍦ㄥ渾鐨勯潰绉櫎浠...
绛旓細鍗婂渾鐨勫懆闀锛濆崐鍦嗙殑鍛ㄩ暱锛1/2鍦嗙殑鍛ㄩ暱+鐩村緞=鐩村緞脳蟺梅2+鐩村緞銆鍏紡锛歀锛澫d梅2+d锛2蟺r梅2+d=鍗=蟺r+d=蟺r+2r銆傚湪鏁板锛堝挨鍏舵槸鍑犱綍锛変腑锛屽崐鍦嗘槸褰㈡垚涓鍗婂渾鐨勭偣鐨勪竴缁磋建杩广傚崐鍦嗙殑鍦嗗姬鎬绘槸娴嬮噺180掳锛堢浉褰撲簬蟺寮у害鎴栧崐鍦堬級銆傚渾鐨勪换鎰忎竴鏉$洿寰勭殑涓や釜绔偣鎶婂渾鍒嗘垚涓ゆ潯寮э紝姣忎竴鏉″姬閮...
绛旓細鍗婂渾鐨勫懆闀垮叕寮忔槸锛欳 = πr + 鐩村緞銆傚叾涓紝π浠h〃鍦嗗懆鐜囷紝r浠h〃鍗婂緞锛岀洿寰勫垯鏄崐寰勭殑涓ゅ嶃傝繖鎰忓懗鐫鍗婂渾鐨勫懆闀胯绠楁棦鍖呮嫭鍗婂渾鐨勫姬闀块儴鍒嗭紝杩樺寘鎷洿寰勪綔涓哄垎鍓茬嚎鐨勪竴娈电洿绾块暱搴︺傝繖涓叕寮忓彲浠ョ敤鏉ュ揩閫熻绠椾换浣曠粰瀹氬崐寰勭殑鍗婂渾鍛ㄩ暱銆傛帴涓嬫潵瀵瑰叕寮忚繘琛 涓銆佸崐鍦嗙殑鍛ㄩ暱鍖呮嫭涓ら儴鍒嗭細鍗婂渾寮у拰鐩村緞銆傚崐鍦嗗姬...
绛旓細1銆鍗婂渾鐨勫懆闀锛1/2鍦嗙殑鍛ㄩ暱+鐩村緞=鐩村緞脳蟺梅2+鐩村緞銆2銆鍏紡锛歀锛澫d梅2+d锛2蟺r梅2+d=鍗=蟺r+d=蟺r+2r銆3銆佸湪鏁板锛堝挨鍏舵槸鍑犱綍锛変腑锛屽崐鍦嗘槸褰㈡垚涓鍗婂渾鐨勭偣鐨勪竴缁磋建杩广4銆佸崐鍦嗙殑鍦嗗姬鎬绘槸娴嬮噺180掳锛堢浉褰撲簬蟺寮у害鎴栧崐鍦堬級銆5銆佸渾鐨勪换鎰忎竴鏉$洿寰勭殑涓や釜绔偣鎶婂渾鍒嗘垚涓ゆ潯寮э紝姣忎竴鏉...