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means you have to prove that two triangles 3 sides are equal
you have to prove two sides and one angle is equal for the two triangles
there is no prove
there are axioms
its just considered
for example who can easily get that if the sides of a triangle are 3cm ,4cm and 5cm is congruent with a triangle with side 3cm ,4cm and 5cm
we have questions in exam like- If in 2 triangles, the sides are proportional to the sides of other triangle then prove that the correspondings angles are equal and the 2 triangles are similar.