Use a Calculator to Find the Acute Angle Between the Planes

question 90

Multiple Choice

Use a calculator to find the acute angle between the planes to the nearest thousandth of a radian.
--5x - 3y - 8z = 7 and 6x + 5y - 9z = 8

• A) 0.231 rad
• B) 0.742 rad
• C) 1.435 rad
• D) 1.34 rad

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