Respuesta :

Answer:

x = 21º

Step-by-step explanation:

∆ ABC is isosceles therefor

Angles B and C are congruent

(180  - 18)/2 = 162/2 = 81º

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∆ BCD is equilateral  therefor all angles are 60º

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x = = 81 - 60

x = 21º

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