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Option 1 : 10√2
1. Square:
Sides = 20 m
Diagonal = 20√2 m
2. Triangle 1:
Sides = 20 m
Hypotenuse = 20√2 m
Perpendicular on hypotenuse = 10√2 m
3. Triangle 2:
Sides = 10√2 m
Hypotenuse = 20 m
Perpendicular on hypotenuse = 10 m
In triangle 3, side of triangle 2 is its hypotenuse so answer is 10√2 m
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