Let the required length be x.
Therefore, analysing the composite plane shape.
It implies, the required length, x will make a right-angled isosceles triangle with two radii length, 4 units each of the circle where x is the hypotenuse of the isosceles right-angled triangle.
Therefore;
x² = 4²+4²
x² = 32
x = √(32)
x = 4√(2) units.
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