ellipse所有意思如题没有省略的意思吗 省略的名词想问是什么？

农夫约翰在一个椭圆映射内由方程给出双方中,X^/a^+Y^/b^=1,（a>b>0） 他正站在点（3,0）,他眼前一亮的激光指针在y方向.光反映了椭圆和收益直接向一个叫布朗的农民,在到达他之前这束光经过了10个单位长度 农民约翰然后转过身一圆;在何处,他点的激光,光反映过墙昂点击农夫布朗是什么顺序对（a,b）.

The area of an ellipse in the form (x*x/a*a)+(y*y)/(b*b)=1 is
A=pi*a*b.(pi = 3.14)

e
It should be two lines.

椭圆 ellipse 的 小径 （minor axis）

Let's assume the major axis is the x-axis,the ellipse is expressed as x²/a² + y²/b² = 1
The foci are F1(-c,0),F2(c,0),F1F2 = 2c = 2√(a² - b²)
The vertexes on the major axis are A1(-a,0),A2(a,0),A1A2 = 2a
F1 and F2 are two points of the trisection of the major axis,so A1A1 = 3F1F2
2a = 3*2√(a² - b²)
a = 3√2b/4
c = √2b/4
Its directrixes are:y = ±a²/c,the distance between them is 2a²/c = 9√2b/2
2a²/c :2√(a² - b²) = 9√2b/2 :2*√2b/4 = 9

ellipse(250,250,0,360,top,bottom);
参数从左往右分别是：
圆心x坐标,圆心y坐标,起始角度,终止角度,x轴半径,y轴半径

接口PlaneGraphics：public interface PlaneGraphics
{
public double area();

public double perimeter();

public String print();
}类Ractangle：
public class Ractangle implements PlaneGraphics
{
public double a;
public double b;

@Override
public double area()
{
// TODO Auto-generated method stub
return a * b;
}

@Override
public double perimeter()
{
// TODO Auto-generated method stub
return 2 * (a + b);
}

@Override
public String print()
{
// TODO Auto-generated method stub
return "类型：长方形；属性：长" + a + ",宽" + b + "；面积：" + area() + "；周长："
+ perimeter();
}

}类Ellipse：public class Ellipse implements PlaneGraphics
{

public double a;
public double b;

@Override
public double area()
{
// TODO Auto-generated method stub
return Math.PI * a * b;
}

@Override
public double perimeter()
{
// TODO Auto-generated method stub
return 0;
}

@Override
public String print()
{
// TODO Auto-generated method stub
return "类型：椭圆；属性：a轴" + a + ",b轴" + b + "；面积：" + area() + "；周长："
+ perimeter();
}

}正方形类：public class Square extends Ractangle
{
public int a;

@Override
public double area()
{
// TODO Auto-generated method stub
return a * a;
}

@Override
public double perimeter()
{
// TODO Auto-generated method stub
return 4 * a;
}

@Override
public String print()
{
// TODO Auto-generated method stub
return "类型：正方形；属性：边长" + a + "；面积：" + area() + "；周长：" + perimeter();
}

}圆形类：
public class Round extends Ellipse
{
public int r;

@Override
public double area()
{
// TODO Auto-generated method stub
return Math.PI * r * r;
}

@Override
public double perimeter()
{
// TODO Auto-generated method stub
return 2 * Math.PI * r;
}

@Override
public String print()
{
// TODO Auto-generated method stub
return "类型：圆；属性：半径" + a + "；面积：" + area() + "；周长：" + perimeter();
}

}

你可以把这些输入谷歌或微软英库中,见下面链接,会有音标,点击小喇叭还可以听到发音.

以形状中心点绘制一个rectangle（正方形）或者是ellipse（圆形）
可以通过开关进行掏空,并做形状叠加、扩散的动画
是绘制特殊图形的一种方法,也是做形状碰撞动画的一种方法