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21 June, 00:34

If m is 21 inches, j is 28 inches, and ∠K measures 90°, then find k using the Law of Cosines. Round your answer to the nearest tenth.

35 in

49 in

1,225 in

2,401 in

+3
Answers (1)
  1. 21 June, 04:04
    0
    a) 35

    Step-by-step explanation:

    k^2 = m^2 + j^2 - 2 (m) (j) cosK

    k^2 = 21^2 + 28^2 - 2 (21) (28) (cos90)

    k^2 = 441 + 784 - 2 (588) (0)

    k^2 = 1225 - 0

    k^2 = 1225

    √k^2 √1225

    k = 35
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