well, let's notice something, we have two 45° angles, now each of those will give use an equal opposite side, namely if that one side is "x", the other is her twin, "x" as well.
is a right-triangle, so we can use the pythagorean theorem, and we know the sides are x,x,6.

 
        
             
        
        
        
Answer:
1817
Step-by-step explanation:
 
        
             
        
        
        
Answer:

Step-by-step explanation:
this is the equation used to find the average of two numbers.
 
        
             
        
        
        
The comlete question with the diagram is in the picture attached.
Answer:
Point    is the vertex of the angle marked in the figure.
   is the vertex of the angle marked in the figure.
Explanation:
When two lines intersect each other they will form an <em>angle</em> and the intersection point will be the <em>vertex of the angle</em>.
In the figure attached, the line that joins the points A and B and the line that joins the points C and D intersect at the point E, forming the corresponding angle (shadowed in the figure).
Such intersection point, which marks the angle, is the vertex of the angle.