State whether the given measurements determine zero, one, or two triangles.

B = 81°, b = 26, c = 28

Let's apply the law of sine to calculate angle C

sin (81) / 26 = sin (C) / 28

0.1646 = sin (C) / 28 and sin (C) = 1.063. Sine sin (α) cannot be > than 1, so this triangle is invalid