c++ How can I append 3 values at once to a 2d array?

[fishies]

#ifndef __dot_h
#define __dot_h
#include <iostream>

struct dots
{
private:

dots();
~dots();
float points[3][3];
float mids[2][3];

public:

float x(int point);
float y(int point);
float z(int point);
void Init_dots();
void Add_dots(float x1,float y1, float z1);
void Add_dots(float x1,float y1, float z1,float x2, float y2, float z2);
void Print_dots();

};

dots:ots()
{

}

dots::~dots()
{
delete points;
delete mids;
}

float dots::x(int point)
{
return points[point-1][0];
}

float dots::y(int point)
{
return points[point-1][1];
}

float dots::z(int point)
{
return points[point-1][2];
}

void dots::Init_dots()
{
for(int i=0;i<((sizeof(points)/sizeof(float))-1)/3;i++)
{
for(int j=0;j<3;j++)
{
points[i][j]=i+j;
}
}
}

void dots::Add_dots(float x1,float y1, float z1)
{
points[(sizeof(points)/sizeof(float))/3]={x1,y1,z1};
}

void dots::Add_dots(float x1,float y1, float z1,float x2,float y2, float z2)
{
points[sizeof(points)/sizeof(float)]={x1,y1,z1};
points[sizeof(points)/sizeof(float)]={x2,y2,z2};
}

void dots::Print_dots()
{
for(int p=0;p<=(sizeof(points)/sizeof(float))-1;p++)
{
cout << points[p];
cout << "\n";
}
}



#endif;

The problem occurs in "Add_dots" fuction. I want to be able to append 3 vales to the 2d array all at once if this is possible. I am pretty new to programming so if you see any other errors/better ways of doing things I am open to suggestions. Thank you.