Drawing line in flash- via Action script

I need to draw a line in ActionScript(based on calculated conditions for length and rotation)

I tried the following code- the triangle with the fill appears- but not the line with the lineStyle- Could you pls help me开发者_StackOverflow社区 out on this... c is defined as UIComponent

var myShape:Shape=new Shape();  
myShape.graphics.moveTo(100,100);  
myShape.graphics.lineTo(200,200);  
myShape.graphics.lineStyle(2,0xFF0000,.75);  
c.addChild(myShape);                

var triangleHeight:uint = 100;  
var triangle:Shape = new Shape();
// red triangle
triangle.graphics.beginFill(0xFF0000);  
triangle.graphics.moveTo(triangleHeight/2, 200);  
triangle.graphics.lineTo(triangleHeight, triangleHeight);  
triangle.graphics.lineTo(0, triangleHeight);  
triangle.graphics.lineTo(triangleHeight/2, 200);  
c.addChild(triangle);       

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You should declare line style before your drawing.