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By using Pythagoras' theorem
By using Pythagoras' theorem.
Add all four sides. If you don't know the side lengths then you must know either {height and diagonal from top to bottom-corner} or {diagonal from bottom-center to bottom-corner}. If you know the first two, then use Pythagoras' Theorem to find the second. Now, double that and use Pythagoras' Theorem to find the side length.
Pythagoras' theorem is applicable to right angle triangles
Using Pythagoras theorem its length is 40 cm and so 2(40+30) = 140 cm which is its perimeter