4 years ago

Please help with this one math question?

1 answer:

8 0

$JK= \sqrt{JL^2+KL^2 -2\cdot JL \cdot KL \cdot cos62^o}\\\\ {} \ \ \ \ \ =\sqrt{3^2+5^2 -2\cdot 3 \cdot 5 \cdot 0.4695} \\\\ {} \ \ \ \ \ =\sqrt{34 -14.085}\\\\ {} \ \ \ \ \ = \sqrt{19.915} \\\\ {} \ \ \ \ \ \approx 4.5 \ \ mm$

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