Find the HAB Angle: Solve the Geometry Problem

[UNknown 2010]

Homework Statement

http://students-bh.com/AA.png
find HAB angle !

Homework Equations

The Attempt at a Solution

 

[n!kofeyn]

Usually, the person posing the question tries to show what work they have. It doesn't have to be the complete solution obviously, but what ideas do you have? Do you have any equations, or can you figure out any of the angles?

 

[UNknown 2010]

I couldn't solve it :(

could you give me a hint ?!

 

[Office_Shredder]

Don't worry about solving it. Can you find ANY of the angles? Write them in terms of X and Y to start

 

[UNknown 2010]

I couldn't

I tried..

 

[Office_Shredder]

Can you at least find angle DHC? I can't believe you can't find any angles in terms of X and Y

 

[UNknown 2010]

Y = 70
X = 20
:)

Now, How can I get HAB ?

 

[symbolipoint]

...? sum of the measures of the interior angles of any (what kind of) quadrilateral... ? 360 degrees...