Calculating the required angle, x.
a = ⅐*180(7-2)
a = ⅐(900)
a is the single interior angle of the regular heptagon.
It implies, the required angle, x is;
Notice.
Length IC is parallel to length EK, meaning 'angle ICE is alternative to angle CEK'.
Therefore;
x = ½(180-a)
x = ½(180-⅐(900))
x = ½*⅐(1260-900)
x = ½*⅐(360)
x = ⅐(180)°
x = 25.7142857143°
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