The answer depends on what the experiment is. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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The probability is 0: there are infinitely many shapes.
1 in 5 is a square so there are 3 squares and 12 non-squares. If the square is not replaced, and the next card is drawn at random the probability of a non-square is 12/14.
useing a punnett square shows two ways to express probability
the punnett square
As all the angles in a square measure 90°, the probability of 2 consecutive angles being congruent is 1.