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Required Solⁿ :-

We know that,

Sum of all angles of a triangle measures upto 180°.

→ 90° + 39° + x° = 180°

→ 129° + x° = 180°

→ x° = 180° - 129°

→ x° = 51°

Verefication :-

As already said, Sum of all the angles of a triangles should measure upto 180°.

So, In verefication we'll adding up all the values equals to 180°.

→ 90° + 39° + 51° = 180°

→ 180° = 180° ✔

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39 +90=129
180-129= 51

The answer is 51
The square means that the angle is a right angle which is 90*

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