1、求陰影部分的周長
先看圖分析：陰影周長S＝半圓周L1+扇形的弧L2+扇形的一條半徑R
計算：半圓直徑＝扇形的半徑＝60cm，扇形的圓心角＝45度
L1＝30π cm
L2=2π*60*(45/360)=15π cm
R=60cm
S=45π+60 (cm)
2、一個圓口水缸，從缸口量得它的內直徑是54dm，缸壁厚3cm。現要用鐵皮給它製作一個缸蓋，使其正好蓋住缸口的
從題目可以看出魚缸的外直徑是546cm (540+2*3), 所以半徑是273cm ,所以其面積是 3.14*273*273
3、條件如下圖，求陰影部分面積
∵大小矩形相似,小矩形長為x ；小矩形寬為60-20=40cm
∴60/40=﹙30＋x﹚/x
x=60cm
S陰影=60×﹙60＋30－40﹚=3000 c㎡
4、如果扇形的面積為60CM,當他的半徑和圓心角各為多少時,扇形面積最大,並求最大值
設半徑為r，則
弧長為60-2r 弧形角度/360度=弧長/圓周長=（60-2r)/(2πr)
弧形面積=πr²*（60-2r)/(2πr)=30r-r²=-（r-15）²+225
所以 r=15 時 弧形的最大面積225平方厘米
圓心角=360*(60-2r)/(2πr)=360(60-30)/(30π)=360/π 度時它的面積最大為225平方厘米
如果本題有什麼不明白可以追問，如果滿意記得採納
如果有其他問題請另發或點擊向我求助，答題不易，請諒解，謝謝。
祝學習進步！
5、求無版權信息的cms
無版權信息的CMS沒有，而且，一般免費版的，未經過許可隨意刪除版權信息，那是侵權的，除非CMS開發者允許修改。而且修改那很簡單，連著都懶得弄，還做什麼網站？
6、collar measurement B/hole to button hole是什麼意思 half bottom hip 60cms down是什麼意思
白領測量的B /孔按鈕孔
半底部髖60cms下降
7、麻煩解決下。謝謝
S小＝4×π×15＝2826cm
G平均＝56.52÷2826＝0.02g／cm
R大＝4×15＝60cm
S大＝4×π×60＝45216cm
G大球＝45216×0.02＝904.32g
8、求求了。
梯形的高：（160-40）/2=60cm
s=(40+100)*60=8400平方厘米
9、TOP10大左腳將,誰有誰?
10. Antonio Cabrini卡布里尼
One of the greatest left-backs the Italian game has ever seen, Cabrini joined Juventus from Atalanta in 1976 and spent over a decade in Turin. Equipped with the most elegant left foot, he won 73 caps for his country, scoring nine goals. However, that foot did let him down from the penalty spot in the 』82 World Cup Final.
9. Gheorge Hagi哈吉
The Romanian international helped Brescia into Serie A with a left foot that was one of the most deadly in world football. His 40-yard lob against Colombia in the 1994 World Cup has passed into legend.
8. Zico濟科
The Brazilian ace was one of Serie A』s best players in the 80s and in two years with Udinese scored an amazing 22 goals in 39 games from midfield. The archetypal No 10 had a fabulous repertoire of unbelievable bicycle-kicks and a speciality in the thunderbolt volley.
7. Sinisa Mihajlovic 米哈伊洛維奇
The Serbian』s glorious hat-trick of free-kicks in 1998 for Lazio against former club Sampdoria symbolised the power of Serie A』s greatest ever dead-ball striker. In April 2006 he also scored his 27th top-flight free-kick goal – an absolute record.
6. Beppe Signori西格洛里
A pacey hitman who scored 107 goals in 152 games for Lazio in the mid 90s. His trick was using boots one size too small in the belief that it improved his touch and accuracy. It clearly worked as he was Capocannoniere on three occasions.
5. Christian Vieri維埃里
Always the focal point of any team』s attack, it seemed as though his left leg swung in slow motion but the resulting shot was usually as accurate as an Exocet missile. While playing for Inter he scored 103 goals in just 144 games. Deadly with his left foot, dire with his right.
4. Roberto Carlos卡洛斯
The former Inter left-back had the speed of his left-foot shots clocked at an unbelievable 170kph. The bulk of that power came from his incredible thigh muscles which measured a phenomenal 60cms in circumference.
3. Gigi Riva里瓦
Cagliari』s Rombo di Tuono – Roll of Thunder – possessed a legendary left foot and it helped him score a fabulous 164 goals in 315 games. He was Serie A Capocannoniere in 1970 and also top scorer for the Azzurri with 35 goals in just 42 games. He is said to have once broken a boy』s arm with that notorious left-footed shot of his. Ouch!
2. Giacinto Facchetti法切蒂
The symbol of Il Grande Inter was an overlapping full-back before they were generally recognised as such. His dynamic left peg scored some crucial goals and his crossing from the left wing made many more.
1. Diego Maradona馬拉多納
Napoli legend Diego Maradona scored 353 goals in his career and no less than 320 came with that infamous left foot of his. No 『keeper was safe from his one-step run up and he scored goal after goal from a dead-ball.
10、半徑為30厘米,弧長為60厘米,面積是多少
圓心角是 360º×60÷﹙2π×30﹚＝360º／π
面積是 π×30²×﹙360º／π﹚÷360º＝900平方厘米
面積是900平方厘米。