local shape,cr,show = ... --DOC_HIDE

shape.isosceles_triangle(cr, 70, 70)
show(cr) --DOC_HIDE
 
shape.isosceles_triangle(cr,20,70)
show(cr) --DOC_HIDE
 
shape.transform(shape.isosceles_triangle) : rotate_at(35, 35, math.pi/2)(cr,70,70)
show(cr) --DOC_HIDE