anonymous
  • anonymous
in triangle DEF, m
Mathematics
katieb
  • katieb
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angela210793
  • angela210793
DE=6 cosF=8/10 ---->maybe abt 30..
anonymous
  • anonymous
arccos(8/10)=36.9
anonymous
  • anonymous
okay thats the right anser, but how do i show my work?

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angela210793
  • angela210793
Pythagoras theorem 10^2=8^2+DE^2 100=64+DE^2 DE=sqr36=6 cosF=8/10
angela210793
  • angela210793
understand it?
anonymous
  • anonymous
yessm thank you so much
angela210793
  • angela210793
uw :)

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