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damaskus [11]
3 years ago
12

The rectangular box shown in the figure has dimensions 9" × 5" × 3" (a = 9, b = 5, c = 3). Approximate the angle θ formed by a d

iagonal of the base and a diagonal of the 5" × 3" side. (Round your answer to two decimal places.)
Mathematics
1 answer:
aliina [53]3 years ago
4 0

<span>The simplest method to do this is with the vector dot product. Let the vector A = <9i + 5j> with magnitude √106 be the base diagonal, and B = <5j + 3k> be the diagonal vector on the side, with magnitude √34. Then cos θ = (A dot B) divided by the product of the magnitudes. A dot B =30, so 

cos θ = 30 / √(34 x 106)</span>

<span> = 0.4997 ==></span>

<span> θ = 49.19° is the answer</span>

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