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 从上午10点到下午2点,一共走了(14-10)÷12×360°= 120°
所以扫过的扇形面积为 (120°/360°)×3.14×6×6 =38平方厘米
2 设圆心角为x,则(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已知一个扇形的面积是100平方厘米,现将它的圆心角扩大为原来的2倍,而将它的半径缩小为原来的2分之1,这样所得的扇形面积是多少呢?
现将它的圆心角扩大为原来的2倍,它面积是原来的2倍
而将它的半径缩小为原来的2分之1,它面积是原来的1/4
100*2*1/4=50
欧阳修先生四岁时父亲就去世了,他成了孤儿,家里没有钱供他读书.
还未抄完,就已经能背诵文章