Hello!
The figure you see has two lines, which are perpendicular to one another.
In one angle of the figure, you can see that it is a right angle, meaning that ell of the other angles on the figure also measure 90 degrees.
The arc also contains a part of another 90 degrees, from which 26 degrees is subtracted.
You get the grand total of 154 degrees.
So, the answer to your question is 154 degrees.
