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30 ° - 60 ° - 90 ° triangle theorem states that:
Base of the triangle is:
The height of the triangle is:
The hypotenuse of the triangle is:
Therefore, we have then that the height is:
From where we conclude that the value of x is:
Thus, the length of the base is:
Finally, the length ZX is:
Substituting values:
Answer:
the length of the lower base, ZX is:
option 3