Discussion
A line makes 35 degrees with a plane. The angle it makes with the normal to that plane is
Answer: A
Correct answer: 55 degrees
The angle a line makes with a plane and the angle it makes with the normal to that plane are complementary: \[ 90 - 35 = 55^\circ. \] The distinction matters because the two are easily interchanged, and a solution that quotes the angle with the normal where the angle with the plane was wanted is out by exactly this amount.
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