Find all the missing parts to the triangle below.

http://www.aventalearning.com/courses/GEOMx-HS-A09/b/assessments/R-LawofCosinesShortAnswerQuiz/Geometry_8.4.14_Quiz_FINAL_10q.gif

Question

Find all the missing parts to the triangle below.

http://www.aventalearning.com/courses/GEOMx-HS-A09/b/assessments/R-LawofCosinesShortAnswerQuiz/Geometry_8.4.14_Quiz_FINAL_10q.gif

vera_ewing · Answer

@dan815 please help? :)

vera_ewing · Answer

@thomaster do you know how to do this?

vera_ewing · Answer

@Loser66 please help me

dan815 · Answer

cos law

vera_ewing · Answer

?

dan815 · Answer

c^2=a^2+b^2-2ab*cos(87deg)

dan815 · Answer

solve for c, c is the side opposite the angle given, a and b are the other 2 sides

vera_ewing · Answer

how do i solve?

dan815 · Answer

you plug the numbers into the equation

vera_ewing · Answer

ok so it would be c^2=15^2+28^2-2ab*cos(87deg) ?

vera_ewing · Answer

what would i do next?

vera_ewing · Answer

@dan815 sorry im really confused

dan815 · Answer

sub in for the other a and b in there too

dan815 · Answer

c^2=15^2+28^2-2*15*28*cos(87deg) ?
now put all that into a calculator
and you have c^2 so finally sqrt everything for C

dan815 · Answer

make sure you use degree mode on calculator

dan815 · Answer

after that you can use sine law to find the missing angles

vera_ewing · Answer

f = 31, G = 64° and H = 29° ? @dan815