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In ΔKLM, k = 89 cm, l = 20 cm and m=81 cm. Find the measure of ∠K to the nearest 10th of a degree.

In ΔKLM, k = 89 cm, l = 20 cm and m=81 cm. Find the measure of ∠K to the nearest 10th of a degree.
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In ΔKLM, k = 89 cm, l = 20 cm and m=81 cm. Find the measure of ∠K to the nearest 10th of a degree.

User Logaretm
by
9.5k points

1 Answer

0 votes

Answer:

107.2

Explanation:

  1. cosK= (81^2)+(20^2)-(89^2) / 2(81)(20)
  2. cosK= -960 / 3,240
  3. cosK= -02963
  4. K= cos^-1(0.9230)
  5. K=107.2
User Vander
by
8.3k points
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