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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

Respuesta :

meaghanmarques

Answer:

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

Answer:a 35

Step-by-step explanation:

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