Question

please help me in this question

prove that all congruent triangles are similar.

Answer 1

since
in congrate triangle
I take triangle ABC congrate triangle DEF
AB=DE or AB/DE=1......(1)
BC=EF or BC/EF=1......(2)
AC=DF or AC/DF= 1.....(3)
Using (1),(2)&(3)
we can say that AC/DE=BC/EF=AC/DF=1
SO all the congrats triangles are similar