Find the angle between the vectors. (First find an exact expression of the cosine angle and then the approximate angle to the nearest degree.) $a = 9 l ? 5 j + k_{4} b = 3 l ? k$ exact approximate Need Help? I8. [4.54/4.54 Points] Use vectors to decide whather the thangle with vertices $P (1, ? 1, ? 3), Q (2, 2, ? 5)$ , and $R (6, 0, ? 6)$ is right-angled.

Question

Find the angle between the vectors. (First find an exact expression of the cosine angle and then the approximate angle to the nearest degree.)

a = 9 l ? 5 j + k_{4} b = 3 l ? k

exact approximate Need Help? I8. [4.54/4.54 Points] Use vectors to decide whather the thangle with vertices

P (1, ? 1, ? 3), Q (2, 2, ? 5)

, and

R (6, 0, ? 6)

is right-angled.

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