Cassandra assigns values to some of the measures of triangle ABC. If angle A measures 30°, a = 6, and b = 18, which is true? The triangle does not exist because StartFraction sine A over a EndFraction. cannot equal StartFraction sine B over b EndFraction.. The triangle is a right triangle because 30° times 3 is 90°, and 6 times 3 is 18. There is one non-right triangle that can be created with those measures because a < b. There are two non-right triangles that can be created with those measures because a < b < A.