a² = 4²+(5+3)²
a = √(80)
a = 4√(5) units.
a is the hypotenuse of the ascribed right-angled triangle.
Observing similar plane shape (right-angled) side length ratios to get ?, the required length.
4 - ?
4√(5) - 3
Cross Multiply.
4√(5)? = 12
? = 12/(4√(5))
? = 3/√(5)
? = ⅕(3√(5)) units.
? = 1.3416407865 units.
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