length = 10;
width = 10;
a = 0;
b = 30;
c = 0;
d = 10;
inside = 5;
widthSquare = 10;
lengthSquare = 20;

module tree(){
    translate ([a,0*b,c]) {polygon(points=[[0,0],[-4*length,0],[0,5*width]], paths=[[0,1,2]]);}
    translate ([a,1*b,c]) {polygon(points=[[0,0],[-3*length,0],[0,5*width]], paths=[[0,1,2]]);}
    translate ([a,2*b,c]) {polygon(points=[[0,0],[-2*length,0],[0,4*width]], paths=[[0,1,2]]);}

    
    translate ([a,0*b,c]) {polygon(points=[[0,0],[4*length,0],[0,5*width]], paths=[[0,1,2]]);}
    translate ([a,1*b,c]) {polygon(points=[[0,0],[3*length,0],[0,5*width]], paths=[[0,1,2]]);}
    translate ([a,2*b,c]) {polygon(points=[[0,0],[2*length,0],[0,4*width]], paths=[[0,1,2]]);}
    translate ([a,-0.5*c,c]) square([widthSquare, lengthSquare], true);
}

difference(){
    tree();
    translate ([0, 70,0]) square([1, 70], true);
}