I need to find the value for h. I know I need to use cos or sin or tan but Im just not really sure where to start. I am pretty sure that the answer will be in between 30 and 40. Given: that AB is 40 and CD is 60. M and N are the midpoints of AB and CD respectively. Lines that appear horizontal and vertical are. Please show work! Thank you!

here is a link to the picture of it is to small: http://oi45.tinypic.com/2vnkqv4.jpg