How do i generate a triangle with just inputting base length and two base angles?

This is my code below,i was able to just generate a equilateral triangle.

%Triangle=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 
   subplot(1,1,1)
  sides = 3;
   t = (1/(2*sides):1/(sides):1)*2*pi-pi/3;
   b = 25;
   x = b*sin(t)+5/8*xmax;
   y = b*cos(t)+3/4*ymax;
   fill(x,y,'black');