To find the value of \(a\), we first need to clarify the context in which you have provided the angles. It appears that you have an isosceles triangle with two angles given as \(35^\circ\) each, and you are trying to find the third angle \(X\).
According to the properties of a triangle, the sum of all interior angles is always \(180^\circ\).
Using this rule, we can set up the equation:
\[ 35 + 35 + X = 180 \]
Now, simplify the left side:
\[ 70 + X = 180 \]
To find \(X\), subtract \(70\) from each side:
\[ X = 180 - 70 \] \[ X = 110 \]
Thus, \(X = 110^\circ\).
If you are looking for the value of \(a\) in the context of the triangle, then \(a\) would be the angle \(X\):
\[ a = 110^\circ \]
So, the value of \(a\) is \(110\) degrees.