Regular heptagon, finding value of unknowns

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Frank212
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Homework Statement


bandicam 2016-08-14 13-44-31-309.jpg


Homework Equations


(n-2)*180[/B]

The Attempt at a Solution


11.a: 7-2=5, 5*180= 900. 900/7= 128.57 degrees
b. How do you find the unknowns?[/B]
 

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Frank212 said:
How do you find the unknowns
It may help to concentrate on one small piece. Look at the triangle at the top.
 
haruspex said:
It may help to concentrate on one small piece. Look at the triangle at the top.
How do I use 128.57 degrees to help me find the unknowns?
 
Frank212 said:
How do I use 128.57 degrees to help me find the unknowns?
Do you know any of the angles in the top triangle?