[Tutor] help

[Dan Deternova]

i am making a simple script to get the hang of Tkinter. i want to use the 
input of the user from a Entry and calcuate the area. i have tryied many 
way... as you can see in my script. the Entry is under def area(): and the 
output i want is under def cal(): ... please help me fix my code and explain 
to me what you did.. thanks in advance.

~moparfan90 at gmail.com
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