Regular heptagon, finding value of unknowns

[Frank212]

Homework Statement

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]

 

[haruspex]

How do you find the unknowns

It may help to concentrate on one small piece. Look at the triangle at the top.

 

[Frank212]

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?

 

[haruspex]

How do I use 128.57 degrees to help me find the unknowns?

Do you know any of the angles in the top triangle?