Question: Triangle ABC is rotated 90° about the origin and then reflected over the y-axis to form triangle A′B′C′. One of the angles in triangle ABC has a measure of 115°. One of the angles in triangle A′B′C′ has a measure of 40°. Which is the measure of an angle in triangle ABC?
A) 25°
B) 75°
C) 155°
D) 180°
Correct answer: A
Grade: 8 | Topic: Geometry | Difficulty: Hard | Standard: 8.G.A.1