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Find the measure of DE

Answers; 

15.9

13.4

12.3

14.5

 Dec 17, 2020
 #1
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-1

13.4

 

cool-Abi

 Dec 17, 2020
 #2
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Abi.....PLEASE avoid just posting an answer with no explanation !   It is of no use to anyone actually wanting HELP trying to LEARN !!

 

Law of Cosines

DE 2 = 12+ 132 - 2 (12)(13) cos 59o       Do the math on the right side ...then take the square root to find  DE

 Dec 17, 2020

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