How can two isosceles triangles be congruent?
There are five ways to find if two triangles are congruent:
SSS (side, side, side) SSS stands for "side, side, side" and means that we have two triangles with all three sides equal.
SAS (side, angle, side)
ASA (angle, side, angle)
AAS (angle, angle, side)
HL (hypotenuse, leg)
Same is applicable for isosceles triangles too.