半圆的面积怎么求? 半圆的面积和周长的计算公式(急求啊!!!!)
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\u5706\u7684\u534a\u5f84\uff1ar
\u76f4\u5f84\uff1ad
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\u5706\u9762\u79ef\uff1a \uff1b
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\u5706\u7684\u5468\u957f\uff1a \u6216
\u534a\u5706\u7684\u5468\u957f\uff1a \u6216\u8005
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\u53c2\u8003\u8d44\u6599\uff1a
\u767e\u5ea6\u767e\u79d1-\u534a\u5706
\u767e\u5ea6\u767e\u79d1-\u5706\u9762\u79ef\u516c\u5f0f
\u534a\u5706\u7684\u5468\u957f\uff1aC = \u03c0r +2r (\u5706\u5468\u957f\u7684\u4e00\u534a+\u76f4\u5f84)
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\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a
\u767e\u5ea6\u767e\u79d1-\u534a\u5706
你好,首先来说圆的面积公式为派r的平方,那么半圆的面积就是派r的平方再除以2就是半圆的面积哦,希望可以帮助到你!
先根据半圆的半径求出整圆的面积,再除以二就可以了。s半圆=3.14乘r的平方再除以二。(注:r是圆的半径)
半圆的面积
=圆的面积/2
=(πR^2)/2。
(其中的π表示圆周率,R表示圆的半径)。
S=1/2*πR²
S为半圆面积
R为半径
设这个半圆的半径为r,那么其面积就是πr^2/2
绛旓細鍗婂渾鐨勯潰绉鍏紡鏄細S鍗婂渾=(蟺r2)梅2銆傚渾闈㈢Н鍏紡鏄竴绉嶅畾鐞嗗畾寰嬨備负鍦嗗懆鐜*鍗婂緞鐨勫钩鏂癸紝鐢ㄥ瓧姣嶅彲浠ヨ〃绀轰负锛歋=蟺r²鎴朣=蟺*锛坉/2)²銆傦紙蟺琛ㄧず鍦嗗懆鐜囷紙3.1415926鈥︹︼級锛宺琛ㄧず鍗婂緞锛宒琛ㄧず鐩村緞锛夈傚渾鐨勫崐寰勶細r 鐩村緞锛歞 鍦嗗懆鐜囷細蟺锛堟暟鍊间负3.1415926鑷3.1415927涔嬮棿鈥︹︽棤闄愪笉寰幆...
绛旓細鍗婂渾鐨勯潰绉=鍦嗙殑闈㈢Н梅2 =蟺r²梅2
绛旓細鍗婂渾闈㈢Н鏄14.13cm²銆傦紙涓锛夎В棰樿繃绋:2*R+蟺*R=15.42銆傚彇蟺=3.14锛屼篃灏辨槸5.14*R=15.42锛屽緱鍒癛=3cm銆傚崐鍦嗛潰绉绠楀叕寮忎负:S=锛埾*R²锛/2锛屽緱鍒扮瓟妗14.13cm²銆傦紙浜岋級瑙i鎬濊矾:宸茬煡鍗婂渾鐨勫懆闀匡紝闇瑕佹眰瑙鍗婂渾鐨勯潰绉锛岃仈鎯冲崐鍦嗛潰绉眰瑙e叕寮忥紝鍒欐湭鐭ユ暟涓哄崐寰凴锛岃鎯冲緱鍒癛锛...
绛旓細3銆佸洜涓哄彧闇鐭ラ亾鍦嗙殑鐩村緞鍗冲彲锛屾墍浠ラ櫎浠2鍗冲彲寰楀埌鍗婂緞銆4銆佷緥濡傦紝鍦嗙殑鐩村緞涓10鍘樼背锛岄櫎浠2涓5鍘樼背锛屽崐寰勪负5鍘樼背銆傛眰鍑哄渾鐨勬暣浣撻潰绉紝鍐嶉櫎浠2銆5銆佸渾闈㈢Н鐨勮绠楀叕寮忎负r2锛屽叾涓璕鏄渾鐨勫崐寰勩傚洜涓烘眰鍑轰簡鍗婂渾鐨勯潰绉锛屼篃灏辨槸鏁翠釜鍦嗙殑涓鍗婏紝鎵浠ョ敤杩欎釜鍏紡姹傚嚭缁撴灉鐨勮瘽锛屾湁蹇呰闄や互2銆6銆佸洜姝わ紝鍗婂渾鐨...
绛旓細瀛楁瘝鍏紡锛歋鍗婂渾=蟺r²梅2銆傚崐鍦嗗舰闈㈢Н鏄笌瀹冪瓑鐩村緞鐨勫渾闈㈢Н鐨勪竴鍗娿傚渾闈㈢Н璁$畻鍏紡涓合r^2锛屽嵆鍦嗗懆鐜嚸楀崐寰勭殑骞虫柟銆傛墍浠ュ崐鍦嗗舰鐨勯潰绉负锛埾r²)/2鎴栂D²/8銆傚浣曟眰鍗婂渾鐨勯潰绉锛氬彧瑕佹眰鍑轰竴涓渾鐨勯潰绉劧鍚庨櫎浠2灏辨槸鍗婂渾闈㈢Н浜嗐傛垜浠煡閬撳渾闈㈢Н鏄渾鍗婂緞骞虫柟涔樹互鍦嗗懆鐜囥傞偅涔堝崐鍦嗗氨...
绛旓細鍗婂渾鐨勯潰绉鍏紡鏄紝s=蟺r^2/2锛埾脳鍗婂緞鐨勫钩鏂姑2锛夛紝鍗婂渾鐨勫懆闀垮叕寮忔槸锛孋=蟺r+2r锛埾脳鍗婂緞+鐩村緞锛夈傚叾涓潰绉槸鍦嗙殑涓鍗婏紝鍛ㄩ暱鏄姬闀垮姞鐩村緞鐨勯暱搴︺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畠鍙湁涓鏉″绉扮嚎锛堝弽灏勫绉帮級銆
绛旓細0.5蟺r²r涓哄崐寰勶紝蟺涓鑸彇3.14銆
绛旓細闈㈢Н=2*2*3.14=12.56 鍗婂渾闈㈢Н鏄渾闈㈢Н鐨勪竴鍗婏紝涔熷氨鏄12.56梅2=6.28
绛旓細1.鍗婂渾褰㈢殑鍛ㄩ暱鍏紡=鍦嗗懆鐜嚸楀崐寰+鐩村緞 鐢ㄥ瓧姣嶅叕寮忚〃绀烘槸锛欳鍗=蟺r+2r 2.鍗婂渾鐨勯潰绉鍏紡 鍗婂渾褰㈢殑闈㈢Н鍏紡=鍦嗗懆鐜嚸楀崐寰勭殑骞虫柟梅2 鐢ㄥ瓧姣嶅叕寮忚〃绀烘槸锛歋鍗=蟺r^2梅2 3.鍦嗙殑鍛ㄩ暱鍏紡 鍦嗙殑鍛ㄩ暱=鍦嗗懆鐜嚸 鍦嗙殑鐩村緞= 2脳鍦嗗懆鐜嚸楀渾鐨勫崐寰 鐢ㄥ瓧姣嶅叕寮忚〃绀烘槸锛欳= 蟺d =2蟺r 4.鍦嗙殑闈㈢Н鍏紡 ...
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