1.yours
2.writer
3.My favorite food - delicate and clinking hamburger.
Hamburgers most outside are pieces of bread, yellow bread wore white sesame and the second layer that is white, kinder cream, The third is that green uncooked lettuce leaf; The fourth floor is Fried it yellow chicken nuggets, beef, pigs block... Sure looks like a circular bread, if smell must make you crazy, fondle admiringly.
Hamburgers every chomp are very delicious, that every time let me eat hold to break belly
1 從上午10點(diǎn)到下午2點(diǎn),一共走了（14-10）÷12×360°= 120°
所以掃過的扇形面積為 （120°/360°）×3.14×6×6 =38平方厘米
2 設(shè)圓心角為x,則（x/360）×3.14×2×2= 3.14×1×1,即x/360=1/4,x=90度
3 （72°/360°）×3.14×1500×1500 =1413000平方...
4已知一個(gè)扇形的面積是100平方厘米,現(xiàn)將它的圓心角擴(kuò)大為原來的2倍,而將它的半徑縮小為原來的2分之1,這樣所得的扇形面積是多少呢?
現(xiàn)將它的圓心角擴(kuò)大為原來的2倍,它面積是原來的2倍
而將它的半徑縮小為原來的2分之1,它面積是原來的1/4
100*2*1/4=50
歐陽修先生四歲時(shí)父親就去世了,他成了孤兒,家里沒有錢供他讀書.
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