下面Shape类是一个表示形状的抽象类,Area （ ）为求图形面积的函数.请从Shape类派生梯形类（Trapezoi
下面Shape类是一个表示形状的抽象类,Area （ ）为求图形面积的函数.请从Shape类派生梯形类（Trapezoid）、圆形类（Circle）,三角形类（Triangle）,并给出具体的求面积函数.其中,所有派生类计算面积需要用到的参数由构造函数给出,梯形面积计算需要上底、下底和高,三角形面积需要底和高,圆形面积需要半径.
形状的抽象类声明如下：
class Shape {
public:
virtual double Area（ ） = 0;
};
形状的抽象类声明如下：
class Shape {
public:
virtual double Area（ ） = 0;
};
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class Trapezoid :public Shape
{
private:
x05double top;
x05double bottom;
x05double height;
public:
x05Trapezoid(double t,double b,double h)
x05{
x05x05top = t;
x05x05bottom = b;
x05x05height = h;
x05}
x05double Area()
x05{
x05x05return (top + bottom) * height / 2;
x05}
};
#define PI 3.1415926
class Circle :public Shape
{
private:
x05double r;
public:
x05Circle(double r)
x05{
x05x05this->r = r;
x05}
x05double Area()
x05{
x05x05return PI * r * r;
x05}
};
class Triangle :public Shape
{
private:
x05double bottom;
x05double height;
public:
x05Triangle(double b,double h)
x05{
x05x05bottom = b;
x05x05height = h;
x05}
x05double Area()
x05{
x05x05return bottom * height / 2;
x05}
};
{
private:
x05double top;
x05double bottom;
x05double height;
public:
x05Trapezoid(double t,double b,double h)
x05{
x05x05top = t;
x05x05bottom = b;
x05x05height = h;
x05}
x05double Area()
x05{
x05x05return (top + bottom) * height / 2;
x05}
};
#define PI 3.1415926
class Circle :public Shape
{
private:
x05double r;
public:
x05Circle(double r)
x05{
x05x05this->r = r;
x05}
x05double Area()
x05{
x05x05return PI * r * r;
x05}
};
class Triangle :public Shape
{
private:
x05double bottom;
x05double height;
public:
x05Triangle(double b,double h)
x05{
x05x05bottom = b;
x05x05height = h;
x05}
x05double Area()
x05{
x05x05return bottom * height / 2;
x05}
};
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