All equilateral triangles are congruent.

There are three squares, one with side length $5\mathrm{cm}$, other with length double the first one and other with sides$5\mathrm{cm}$ but it is rotated by an angle. Which of them is congruent? Why?
                        

Among two congruent angles, one has a measure of $70°$, the measure of the other angle is _____$°$.

Two rectangles are congruent if they have ?

In the figure below, are line segments $AB$ and $CD$ congruent?

When we write $\angle A=\angle B$, we actually mean that both the angles are _____. (equal/unequal)

In below figure, if $AC=BD$, prove that $AB\cong CD$.

State whether the following figures are congruent or not.

Measure the given angles and find which of them are congruent.