The measure of the angle B is 33 degrees
First, it is important to note that an isosceles triangle has two sides of equal length and the angles opposite those sides are of equal measure.
Now, from the diagram shown, we have that the sides of the triangle are both 7 each
Also, the angles A and B are opposite to each other making them equal.
So, then,
If angle A measures 33 degrees
Angle B = 33 degrees