How to solve

Problem #$4($Competency #$2)[20$ pts$].$ In the truss shown, find the forces in members $DE,DK,JK,$ and $KM$ and state whether these members are in tension or compression.

Along BHIJKLF, $BH=HI=IJ=JK=KL=LF=2m.AH,JD,$ and $LG$ are also $2m$ long. CD and DE are both $4m$ long.

$F_{DE}=$

$F_{DK}=$

$F_{JK}=$

$F_{KM}=$