Find, Correct to the Nearest Degree, the Angle Between the Planes

question 160

Multiple Choice

Find, correct to the nearest degree, the angle between the planes.
$$x + y - z = 1,10 x - 15 y + 20 z = 5$$

• A) \(122 ^ { \circ }\)
• B) \(12 ^ { \circ }\)
• C) \(22 ^ { \circ }\)
• D) \(102 ^ { \circ }\)
• E) none of these

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Definitions:

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