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Item 4
Which pair of triangles must be similar?

Triangles 1 and 2 each have a 35º angle.
Triangles 1 and 2 each have a 35º angle.

Triangles 3 and 4 are both isosceles. They each have a 40º angle.
Triangles 3 and 4 are both isosceles. They each have a 40º angle.

Triangle 5 has a 30º angle and a 90º angle. Triangle 6 has a 30º angle and a 70º angle.
Triangle 5 has a 30º angle and a 90º angle. Triangle 6 has a 30º angle and a 70º angle.

Triangle 7 has a 50º angle and a 25º angle. Triangle 8 has a 50º angle and a 105º angle.