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Please help with this one math question?

Please help with this one math question?
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Please help with this one math question?

Please help with this one math question?-example-1
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User Zeba
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JK= √(JL^2+KL^2 -2\cdot JL \cdot KL \cdot cos62^o)\\\\ {} \ \ \ \ \ =√(3^2+5^2 -2\cdot 3 \cdot 5 \cdot 0.4695) \\\\ {} \ \ \ \ \ =√(34 -14.085)\\\\ {} \ \ \ \ \ = √(19.915) \\\\ {} \ \ \ \ \ \approx 4.5 \ \ mm
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User Geoduck
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