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rhiannacj
Hopefully this helps, I have tried to write out all reasoning
Ver imagen rhiannacj
C=30


First in the triangle ABD, each angle is 60 since its an equilateral triangle.
ADE=180-ADB
=180-60
=120
Triangle ADE is an isosceles triangle having 2 equal sides
So it has 2 equal angles DAE=AED
AED+DAE=180-120=60
AED=60/2=30


So C=30