SAT Math Practice: Geometry and Right-Triangle Trigonometry

SAT Math Practice: Geometry and Right-Triangle Trigonometry

Choose one answer. Each attempt draws 10 of 20 questions; the practice pass mark is 8/10. Original topic practice, not an official exam. Areas, volumes, similar triangles and basic trigonometry.
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In a right triangle, the side adjacent to acute θ is 8 and the hypotenuse is 17. What is cos θ?