You can set up the equation like this:
(sin 30°) / 13 = (sin B) / 26
Now, you can solve for sin B:
sin B = (sin 30° * 26) / 13
sin B = (1/2 * 26) / 13
sin B = 13 / 13
sin B = 1
Now, to find angle B, take the arcsin (inverse sine) of 1:
B = arcsin(1)
B = 90°
Now that you have angle B, you can find angle C using the fact that the sum of angles in a triangle is 180°:
C = 180° - A - B
C = 180° - 30° - 90°
C = 60°
So, the solution to the triangle is:
A = 30°
B = 90°
C = 60°
a = 13
b = 26