:[tex]\implies[/tex] perimeter (∆HFM) = HM+FM+HF
:[tex]\implies[/tex] 51 = 2x+5+x+8+3x+2
:[tex]\implies[/tex] 51 = 6x+15
:[tex]\implies[/tex] 36 = 6x
:[tex]\implies[/tex] x = 6 units.
in ∆HFM,
in ∆KFM,
Since, all the sides of one triangle does not correspond to the other, these traingles are not congruent.