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Mathematics 14 Online
OpenStudy (anonymous):

in triangle DEF, m

OpenStudy (angela210793):

DE=6 cosF=8/10 ---->maybe abt 30..

OpenStudy (anonymous):

arccos(8/10)=36.9

OpenStudy (anonymous):

okay thats the right anser, but how do i show my work?

OpenStudy (angela210793):

Pythagoras theorem 10^2=8^2+DE^2 100=64+DE^2 DE=sqr36=6 cosF=8/10

OpenStudy (angela210793):

understand it?

OpenStudy (anonymous):

yessm thank you so much

OpenStudy (angela210793):

uw :)

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