Which of the following pairs of trian...

Which of the following pairs of triangles are congruent? If they are congruent, write out the pairs of equal angles. ` A B C : A B=3c m ,\ B C=4c m ,\ C A=2\ c m` ` D E F : D E=2\ c m ,\ E F=3\ c m\ a n d\ F D=4\ c m` ` P Q R : P Q=17\ c m ,\ Q R=15\ c m ,\ P R=18\ c m` ` D E F : D E=18\ c m ,\ E F=17\ c m ,\ D F=15\ c m` .

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